21311023332 has 12 divisors (see below), whose sum is σ = 49725721136. Its totient is φ = 7103674440.

The previous prime is 21311023303. The next prime is 21311023343. The reversal of 21311023332 is 23332011312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21311023299 and 21311023308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887959294 + ... + 887959317.

Almost surely, 2^21311023332 is an apocalyptic number.

It is an amenable number.

21311023332 is an abundant number, since it is smaller than the sum of its proper divisors (28414697804).

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

21311023332 is a wasteful number, since it uses less digits than its factorization.

21311023332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775918618 (or 1775918616 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21311023332 its reverse (23332011312), we get a palindrome (44643034644).

The spelling of 21311023332 in words is "twenty-one billion, three hundred eleven million, twenty-three thousand, three hundred thirty-two".