21557200982 has 16 divisors (see below), whose sum is σ = 35418526560. Its totient is φ = 9794752128.

The previous prime is 21557200901. The next prime is 21557200993. The reversal of 21557200982 is 28900275512.

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, 10930658 + ... + 10932629.

It is an arithmetic number, because the mean of its divisors is an integer number (2213657910).

Almost surely, 2^21557200982 is an apocalyptic number.

21557200982 is a deficient number, since it is larger than the sum of its proper divisors (13861325578).

21557200982 is a wasteful number, since it uses less digits than its factorization.

21557200982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21863335.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 21557200982 in words is "twenty-one billion, five hundred fifty-seven million, two hundred thousand, nine hundred eighty-two".