21756555022 has 16 divisors (see below), whose sum is σ = 33442984512. Its totient is φ = 10610474080.

The previous prime is 21756555013. The next prime is 21756555053. The reversal of 21756555022 is 22055565712.

It is a congruent number.

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, 367429 + ... + 422512.

It is an arithmetic number, because the mean of its divisors is an integer number (2090186532).

Almost surely, 2^21756555022 is an apocalyptic number.

21756555022 is a deficient number, since it is larger than the sum of its proper divisors (11686429490).

21756555022 is a wasteful number, since it uses less digits than its factorization.

21756555022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790283.

The product of its (nonzero) digits is 210000, while the sum is 40.

The spelling of 21756555022 in words is "twenty-one billion, seven hundred fifty-six million, five hundred fifty-five thousand, twenty-two".