21204154104518 has 64 divisors (see below), whose sum is σ = 41259041694720. Its totient is φ = 7930377168000.

The previous prime is 21204154104487. The next prime is 21204154104521. The reversal of 21204154104518 is 81540145140212.

It is a congruent number.

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, 12949658 + ... + 14494893.

It is an arithmetic number, because the mean of its divisors is an integer number (644672526480).

Almost surely, 2^{21204154104518} is an apocalyptic number.

21204154104518 is a deficient number, since it is larger than the sum of its proper divisors (20054887590202).

21204154104518 is a wasteful number, since it uses less digits than its factorization.

21204154104518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27444773.

The product of its (nonzero) digits is 51200, while the sum is 38.

The spelling of 21204154104518 in words is "twenty-one trillion, two hundred four billion, one hundred fifty-four million, one hundred four thousand, five hundred eighteen".