21636714704 has 80 divisors (see below), whose sum is σ = 47093342976. Its totient is φ = 9625172480.

The previous prime is 21636714689. The next prime is 21636714707. The reversal of 21636714704 is 40741763612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21636714707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990104 + ... + 1011720.

Almost surely, 2^21636714704 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 21636714704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23546671488).

21636714704 is an abundant number, since it is smaller than the sum of its proper divisors (25456628272).

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

21636714704 is a wasteful number, since it uses less digits than its factorization.

21636714704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21705 (or 21677 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 21636714704 in words is "twenty-one billion, six hundred thirty-six million, seven hundred fourteen thousand, seven hundred four".