21470666504636 has 96 divisors (see below), whose sum is σ = 41044100364288. Its totient is φ = 9798765616640.

The previous prime is 21470666504549. The next prime is 21470666504647. The reversal of 21470666504636 is 63640566607412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285921551 + ... + 285996633.

It is an arithmetic number, because the mean of its divisors is an integer number (427542712128).

Almost surely, 2^{21470666504636} is an apocalyptic number.

It is an amenable number.

21470666504636 is a deficient number, since it is larger than the sum of its proper divisors (19573433859652).

21470666504636 is a wasteful number, since it uses less digits than its factorization.

21470666504636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76811 (or 76809 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 21470666504636 in words is "twenty-one trillion, four hundred seventy billion, six hundred sixty-six million, five hundred four thousand, six hundred thirty-six".