21640079577954 has 16 divisors (see below), whose sum is σ = 43307499768192. Its totient is φ = 7208803090608.

The previous prime is 21640079577931. The next prime is 21640079577979. The reversal of 21640079577954 is 45977597004612.

It is a super-2 number, since 2×21640079577954² (a number of 27 digits) contains 22 as substring.

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, 1139181889 + ... + 1139200884.

It is an arithmetic number, because the mean of its divisors is an integer number (2706718735512).

Almost surely, 2^{21640079577954} is an apocalyptic number.

21640079577954 is an abundant number, since it is smaller than the sum of its proper divisors (21667420190238).

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

21640079577954 is a wasteful number, since it uses less digits than its factorization.

21640079577954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278384361.

The product of its (nonzero) digits is 133358400, while the sum is 66.

The spelling of 21640079577954 in words is "twenty-one trillion, six hundred forty billion, seventy-nine million, five hundred seventy-seven thousand, nine hundred fifty-four".