21212113113320 has 32 divisors (see below), whose sum is σ = 48891333886920. Its totient is φ = 8277897799680.

The previous prime is 21212113113311. The next prime is 21212113113343. The reversal of 21212113113320 is 2331131121212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17924368103524 + 3287745009796 = 4233718^2 + 1813214^2 .

It is a super-2 number, since 2×21212113113320² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6467106017 + ... + 6467109296.

Almost surely, 2^{21212113113320} is an apocalyptic number.

21212113113320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212113113320 is an abundant number, since it is smaller than the sum of its proper divisors (27679220773600).

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

21212113113320 is a wasteful number, since it uses less digits than its factorization.

21212113113320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934215365 (or 12934215361 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21212113113320 its reverse (2331131121212), we get a palindrome (23543244234532).

The spelling of 21212113113320 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred thirteen thousand, three hundred twenty".