21653042546634 has 64 divisors (see below), whose sum is σ = 44977299546240. Its totient is φ = 6945340596480.

The previous prime is 21653042546563. The next prime is 21653042546753. The reversal of 21653042546634 is 43664524035612.

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, 2660104 + ... + 7098044.

It is an arithmetic number, because the mean of its divisors is an integer number (702770305410).

Almost surely, 2^{21653042546634} is an apocalyptic number.

21653042546634 is an abundant number, since it is smaller than the sum of its proper divisors (23324256999606).

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

21653042546634 is a wasteful number, since it uses less digits than its factorization.

21653042546634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438295.

The product of its (nonzero) digits is 12441600, while the sum is 51.

The spelling of 21653042546634 in words is "twenty-one trillion, six hundred fifty-three billion, forty-two million, five hundred forty-six thousand, six hundred thirty-four".