21516694304 has 96 divisors (see below), whose sum is σ = 52259800320. Its totient is φ = 8516293632.

The previous prime is 21516694291. The next prime is 21516694313. The reversal of 21516694304 is 40349661512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77402 + ... + 221414.

It is an arithmetic number, because the mean of its divisors is an integer number (544372920).

Almost surely, 2^21516694304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21516694304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26129900160).

21516694304 is an abundant number, since it is smaller than the sum of its proper divisors (30743106016).

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

21516694304 is a wasteful number, since it uses less digits than its factorization.

21516694304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144082 (or 144074 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 21516694304 in words is "twenty-one billion, five hundred sixteen million, six hundred ninety-four thousand, three hundred four".