21586074084 has 81 divisors (see below), whose sum is σ = 55857664681. Its totient is φ = 7028748480.

The previous prime is 21586074061. The next prime is 21586074199. The reversal of 21586074084 is 48047068512.

The square root of 21586074084 is 146922.

It is a perfect power (a square), and thus also a powerful number.

21586074084 is a `hidden beast` number, since 21 + 586 + 0 + 7 + 40 + 8 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6190227684 + 15395846400 = 78678^2 + 124080^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 41431744 + ... + 41432264.

Almost surely, 2^21586074084 is an apocalyptic number.

21586074084 is the 146922-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21586074084

21586074084 is an abundant number, since it is smaller than the sum of its proper divisors (34271590597).

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

21586074084 is an equidigital number, since it uses as much as digits as its factorization.

21586074084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 21586074084 in words is "twenty-one billion, five hundred eighty-six million, seventy-four thousand, eighty-four".