21506740626604 has 24 divisors (see below), whose sum is σ = 38176297720848. Its totient is φ = 10600110336000.

The previous prime is 21506740626563. The next prime is 21506740626643. The reversal of 21506740626604 is 40662604760512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110320429 + ... + 110515204.

It is an arithmetic number, because the mean of its divisors is an integer number (1590679071702).

Almost surely, 2^{21506740626604} is an apocalyptic number.

It is an amenable number.

21506740626604 is a deficient number, since it is larger than the sum of its proper divisors (16669557094244).

21506740626604 is a wasteful number, since it uses less digits than its factorization.

21506740626604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220835985 (or 220835983 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 21506740626604 in words is "twenty-one trillion, five hundred six billion, seven hundred forty million, six hundred twenty-six thousand, six hundred four".