21023131223232 has 42 divisors (see below), whose sum is σ = 60259009809908. Its totient is φ = 7007710407552.

The previous prime is 21023131223219. The next prime is 21023131223299. The reversal of 21023131223232 is 23232213132012.

21023131223232 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 313 + 1 + 22 + 323 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21023131223196 and 21023131223205.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18249245278 + ... + 18249246429.

Almost surely, 2^{21023131223232} is an apocalyptic number.

It is an amenable number.

21023131223232 is an abundant number, since it is smaller than the sum of its proper divisors (39235878586676).

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

21023131223232 is a wasteful number, since it uses less digits than its factorization.

21023131223232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36498491725 (or 36498491712 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21023131223232 its reverse (23232213132012), we get a palindrome (44255344355244).

The spelling of 21023131223232 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-one million, two hundred twenty-three thousand, two hundred thirty-two".