21317703898 has 16 divisors (see below), whose sum is σ = 32368089600. Its totient is φ = 10528390656.

The previous prime is 21317703881. The next prime is 21317703917. The reversal of 21317703898 is 89830771312.

It is a happy 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, 1202503 + ... + 1220101.

It is an arithmetic number, because the mean of its divisors is an integer number (2023005600).

Almost surely, 2^21317703898 is an apocalyptic number.

21317703898 is a deficient number, since it is larger than the sum of its proper divisors (11050385702).

21317703898 is a wasteful number, since it uses less digits than its factorization.

21317703898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24981.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 21317703898 in words is "twenty-one billion, three hundred seventeen million, seven hundred three thousand, eight hundred ninety-eight".