21345164530 has 16 divisors (see below), whose sum is σ = 39051154584. Its totient is φ = 8398097280.

The previous prime is 21345164443. The next prime is 21345164549. The reversal of 21345164530 is 3546154312.

It can be written as a sum of positive squares in 4 ways, for example, as 10570101721 + 10775062809 = 102811^2 + 103803^2 .

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, 17495427 + ... + 17496646.

Almost surely, 2^21345164530 is an apocalyptic number.

21345164530 is a deficient number, since it is larger than the sum of its proper divisors (17705990054).

21345164530 is a wasteful number, since it uses less digits than its factorization.

21345164530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34992141.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21345164530 in words is "twenty-one billion, three hundred forty-five million, one hundred sixty-four thousand, five hundred thirty".