21688482536 has 64 divisors (see below), whose sum is σ = 46952611200. Its totient is φ = 9199795968.

The previous prime is 21688482509. The next prime is 21688482583. The reversal of 21688482536 is 63528488612.

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, 9295226 + ... + 9297558.

It is an arithmetic number, because the mean of its divisors is an integer number (733634550).

Almost surely, 2^21688482536 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 21688482536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23476305600).

21688482536 is an abundant number, since it is smaller than the sum of its proper divisors (25264128664).

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

21688482536 is a wasteful number, since it uses less digits than its factorization.

21688482536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978 (or 3974 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The spelling of 21688482536 in words is "twenty-one billion, six hundred eighty-eight million, four hundred eighty-two thousand, five hundred thirty-six".