21531645152 has 24 divisors (see below), whose sum is σ = 42394413096. Its totient is φ = 10764810112.

The previous prime is 21531645089. The next prime is 21531645173. The reversal of 21531645152 is 25154613512.

It is a super-2 number, since 2×21531645152² (a number of 21 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 3 ways as a sum of consecutive naturals, for example, 407858 + ... + 457614.

It is an arithmetic number, because the mean of its divisors is an integer number (1766433879).

Almost surely, 2^21531645152 is an apocalyptic number.

It is an amenable number.

21531645152 is a deficient number, since it is larger than the sum of its proper divisors (20862767944).

21531645152 is a wasteful number, since it uses less digits than its factorization.

21531645152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63290 (or 63282 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The spelling of 21531645152 in words is "twenty-one billion, five hundred thirty-one million, six hundred forty-five thousand, one hundred fifty-two".