121221112212 has 36 divisors (see below), whose sum is σ = 314701659636. Its totient is φ = 39314954880.

The previous prime is 121221112211. The next prime is 121221112267. The reversal of 121221112212 is 212211122121.

121221112212 is a `hidden beast` number, since 121 + 221 + 112 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 89751771396 + 31469340816 = 299586^2 + 177396^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221112211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45502089 + ... + 45504752.

Almost surely, 2^121221112212 is an apocalyptic number.

121221112212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121221112212 is an abundant number, since it is smaller than the sum of its proper divisors (193480547424).

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

121221112212 is a wasteful number, since it uses less digits than its factorization.

121221112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91006888 (or 91006883 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121221112212 its reverse (212211122121), we get a palindrome (333432234333).

Subtracting 121221112212 from its reverse (212211122121), we obtain a palindrome (90990009909).

The spelling of 121221112212 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twelve".