21108255754 has 16 divisors (see below), whose sum is σ = 31960506600. Its totient is φ = 10455134400.

The previous prime is 21108255743. The next prime is 21108255761. The reversal of 21108255754 is 45755280112.

It can be written as a sum of positive squares in 4 ways, for example, as 19755708025 + 1352547729 = 140555^2 + 36777^2 .

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, 16204 + ... + 206104.

Almost surely, 2^21108255754 is an apocalyptic number.

21108255754 is a deficient number, since it is larger than the sum of its proper divisors (10852250846).

21108255754 is a wasteful number, since it uses less digits than its factorization.

21108255754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190425.

The product of its (nonzero) digits is 112000, while the sum is 40.

The spelling of 21108255754 in words is "twenty-one billion, one hundred eight million, two hundred fifty-five thousand, seven hundred fifty-four".