21311212232120 has 32 divisors (see below), whose sum is σ = 48086063892720. Its totient is φ = 8500336204800.

The previous prime is 21311212232117. The next prime is 21311212232143. The reversal of 21311212232120 is 2123221211312.

It is a super-2 number, since 2×21311212232120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 754632206 + ... + 754660445.

Almost surely, 2^{21311212232120} is an apocalyptic number.

21311212232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311212232120 is an abundant number, since it is smaller than the sum of its proper divisors (26774851660600).

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

21311212232120 is a wasteful number, since it uses less digits than its factorization.

21311212232120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509293015 (or 1509293011 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21311212232120 its reverse (2123221211312), we get a palindrome (23434433443432).

The spelling of 21311212232120 in words is "twenty-one trillion, three hundred eleven billion, two hundred twelve million, two hundred thirty-two thousand, one hundred twenty".