21888906874 has 4 divisors (see below), whose sum is σ = 32833360314. Its totient is φ = 10944453436.

The previous prime is 21888906841. The next prime is 21888906883. The reversal of 21888906874 is 47860988812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18489200625 + 3399706249 = 135975^2 + 58307^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5472226717 + ... + 5472226720.

Almost surely, 2^21888906874 is an apocalyptic number.

21888906874 is a deficient number, since it is larger than the sum of its proper divisors (10944453440).

21888906874 is a wasteful number, since it uses less digits than its factorization.

21888906874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10944453439.

The product of its (nonzero) digits is 12386304, while the sum is 61.

The spelling of 21888906874 in words is "twenty-one billion, eight hundred eighty-eight million, nine hundred six thousand, eight hundred seventy-four".