21522131364 has 24 divisors (see below), whose sum is σ = 52861375840. Its totient is φ = 6796462464.

The previous prime is 21522131357. The next prime is 21522131377. The reversal of 21522131364 is 46313122512.

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, 47197429 + ... + 47197884.

Almost surely, 2^21522131364 is an apocalyptic number.

It is an amenable number.

21522131364 is an abundant number, since it is smaller than the sum of its proper divisors (31339244476).

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

21522131364 is a wasteful number, since it uses less digits than its factorization.

21522131364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94395339 (or 94395337 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

Adding to 21522131364 its reverse (46313122512), we get a palindrome (67835253876).

The spelling of 21522131364 in words is "twenty-one billion, five hundred twenty-two million, one hundred thirty-one thousand, three hundred sixty-four".