21702928156 has 96 divisors (see below), whose sum is σ = 49028474880. Its totient is φ = 8170170624.

The previous prime is 21702928147. The next prime is 21702928171. The reversal of 21702928156 is 65182920712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1642705 + ... + 1655863.

It is an arithmetic number, because the mean of its divisors is an integer number (510713280).

Almost surely, 2^21702928156 is an apocalyptic number.

21702928156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21702928156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24514237440).

21702928156 is an abundant number, since it is smaller than the sum of its proper divisors (27325546724).

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

21702928156 is a wasteful number, since it uses less digits than its factorization.

21702928156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13403 (or 13401 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21702928156 in words is "twenty-one billion, seven hundred two million, nine hundred twenty-eight thousand, one hundred fifty-six".