12121110 has 32 divisors (see below), whose sum is σ = 32323680. Its totient is φ = 3232224.

The previous prime is 12121103. The next prime is 12121121. The reversal of 12121110 is 1112121.

It is a happy number.

12121110 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12121092 and 12121101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22177 + ... + 22716.

It is an arithmetic number, because the mean of its divisors is an integer number (1010115).

Almost surely, 2^12121110 is an apocalyptic number.

12121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121110 is an abundant number, since it is smaller than the sum of its proper divisors (20202570).

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

12121110 is a wasteful number, since it uses less digits than its factorization.

12121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44909 (or 44903 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12121110 is about 3481.5384530406. The cubic root of 12121110 is about 229.7104737537.

Adding to 12121110 its reverse (1112121), we get a palindrome (13233231).

The spelling of 12121110 in words is "twelve million, one hundred twenty-one thousand, one hundred ten".