21316845474 has 12 divisors (see below), whose sum is σ = 46186498566. Its totient is φ = 7105615152.

The previous prime is 21316845467. The next prime is 21316845493. The reversal of 21316845474 is 47454861312.

21316845474 is a `hidden beast` number, since 2 + 13 + 16 + 84 + 547 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18853212249 + 2463633225 = 137307^2 + 49635^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592134579 + ... + 592134614.

Almost surely, 2^21316845474 is an apocalyptic number.

21316845474 is an abundant number, since it is smaller than the sum of its proper divisors (24869653092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21316845474 is a wasteful number, since it uses less digits than its factorization.

21316845474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184269201 (or 1184269198 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The spelling of 21316845474 in words is "twenty-one billion, three hundred sixteen million, eight hundred forty-five thousand, four hundred seventy-four".