21528995374 has 16 divisors (see below), whose sum is σ = 32429361888. Its totient is φ = 10719241632.

The previous prime is 21528995281. The next prime is 21528995441. The reversal of 21528995374 is 47359982512.

It is a congruent number.

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, 1590724 + ... + 1604200.

It is an arithmetic number, because the mean of its divisors is an integer number (2026835118).

Almost surely, 2^21528995374 is an apocalyptic number.

21528995374 is a deficient number, since it is larger than the sum of its proper divisors (10900366514).

21528995374 is a wasteful number, since it uses less digits than its factorization.

21528995374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16779.

The product of its digits is 5443200, while the sum is 55.

The spelling of 21528995374 in words is "twenty-one billion, five hundred twenty-eight million, nine hundred ninety-five thousand, three hundred seventy-four".