21566134152 has 48 divisors (see below), whose sum is σ = 59832880380. Its totient is φ = 7013376000.

The previous prime is 21566134147. The next prime is 21566134153. The reversal of 21566134152 is 25143166512.

21566134152 is a `hidden beast` number, since 2 + 1 + 566 + 1 + 3 + 41 + 52 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21557874276 + 8259876 = 146826^2 + 2874^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21566134153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3649849 + ... + 3655752.

Almost surely, 2^21566134152 is an apocalyptic number.

It is an amenable number.

21566134152 is an abundant number, since it is smaller than the sum of its proper divisors (38266746228).

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

21566134152 is a wasteful number, since it uses less digits than its factorization.

21566134152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7305654 (or 7305647 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 21566134152 in words is "twenty-one billion, five hundred sixty-six million, one hundred thirty-four thousand, one hundred fifty-two".