12121212 has 48 divisors (see below), whose sum is σ = 29165472. Its totient is φ = 3916800.

The previous prime is 12121211. The next prime is 12121231. The reversal of 12121212 is 21212121.

12121212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between odd and even.

12121212 is an undulating number in base 10.

12121212 is a modest number, since divided by 121212 gives 12 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88408 + ... + 88544.

It is an arithmetic number, because the mean of its divisors is an integer number (607614).

Almost surely, 2^12121212 is an apocalyptic number.

12121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121212 is an abundant number, since it is smaller than the sum of its proper divisors (17044260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121212 is a wasteful number, since it uses less digits than its factorization.

12121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 316 counting only the distinct ones).

The product of its digits is 16, while the sum is 12.

The square root of 12121212 is about 3481.5531017062. The cubic root of 12121212 is about 229.7111180952.

12121212 divided by its sum of digits (12) gives a palindrome (1010101).

Adding to 12121212 its reverse (21212121), we get a palindrome (33333333).

Subtracting 12121212 from its reverse (21212121), we obtain a palindrome (9090909).

It can be divided in two parts, 1212121 and 2, that multiplied together give a palindrome (2424242).

The spelling of 12121212 in words is "twelve million, one hundred twenty-one thousand, two hundred twelve".