113121212220 has 72 divisors (see below), whose sum is σ = 352408265664. Its totient is φ = 29350366848.

The previous prime is 113121212219. The next prime is 113121212233. The reversal of 113121212220 is 22212121311.

113121212220 is a `hidden beast` number, since 11 + 312 + 121 + 2 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 113121212193 and 113121212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8485924 + ... + 8499243.

Almost surely, 2^113121212220 is an apocalyptic number.

113121212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

113121212220 is an abundant number, since it is smaller than the sum of its proper divisors (239287053444).

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

113121212220 is a wasteful number, since it uses less digits than its factorization.

113121212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16985219 (or 16985214 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 113121212220 its reverse (22212121311), we get a palindrome (135333333531).

Subtracting from 113121212220 its reverse (22212121311), we obtain a palindrome (90909090909).

The spelling of 113121212220 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty".