21666035125630 has 32 divisors (see below), whose sum is σ = 44794099929600. Its totient is φ = 7391026478880.

The previous prime is 21666035125627. The next prime is 21666035125661. The reversal of 21666035125630 is 3652153066612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777661416 + ... + 777689275.

It is an arithmetic number, because the mean of its divisors is an integer number (1399815622800).

Almost surely, 2^{21666035125630} is an apocalyptic number.

21666035125630 is an abundant number, since it is smaller than the sum of its proper divisors (23128064803970).

21666035125630 is a wasteful number, since it uses less digits than its factorization.

21666035125630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555350904.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 21666035125630 in words is "twenty-one trillion, six hundred sixty-six billion, thirty-five million, one hundred twenty-five thousand, six hundred thirty".