21739115120 has 160 divisors (see below), whose sum is σ = 52851367296. Its totient is φ = 8309145600.

The previous prime is 21739115117. The next prime is 21739115147. The reversal of 21739115120 is 2151193712.

It is a happy number.

It is a super-2 number, since 2×21739115120² (a number of 21 digits) contains 22 as substring.

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, 64507592 + ... + 64507928.

Almost surely, 2^21739115120 is an apocalyptic number.

21739115120 is a gapful number since it is divisible by the number (20) 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 21739115120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26425683648).

21739115120 is an abundant number, since it is smaller than the sum of its proper divisors (31112252176).

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

21739115120 is a wasteful number, since it uses less digits than its factorization.

21739115120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 32.

The spelling of 21739115120 in words is "twenty-one billion, seven hundred thirty-nine million, one hundred fifteen thousand, one hundred twenty".