21021232111320 has 128 divisors (see below), whose sum is σ = 72340725196800. Its totient is φ = 4786991095296.

The previous prime is 21021232111291. The next prime is 21021232111387. The reversal of 21021232111320 is 2311123212012.

It is a super-2 number, since 2×21021232111320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46289424 + ... + 46741343.

It is an arithmetic number, because the mean of its divisors is an integer number (565161915600).

Almost surely, 2^{21021232111320} is an apocalyptic number.

21021232111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021232111320 is an abundant number, since it is smaller than the sum of its proper divisors (51319493085480).

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

21021232111320 is a wasteful number, since it uses less digits than its factorization.

21021232111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93031057 (or 93031053 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21021232111320 its reverse (2311123212012), we get a palindrome (23332355323332).

The spelling of 21021232111320 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-two million, one hundred eleven thousand, three hundred twenty".