21152612320 has 96 divisors (see below), whose sum is σ = 57323621376. Its totient is φ = 7225459200.

The previous prime is 21152612317. The next prime is 21152612363. The reversal of 21152612320 is 2321625112.

It is a congruent number.

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, 268675 + ... + 338365.

It is an arithmetic number, because the mean of its divisors is an integer number (597121056).

Almost surely, 2^21152612320 is an apocalyptic number.

21152612320 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 21152612320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28661810688).

21152612320 is an abundant number, since it is smaller than the sum of its proper divisors (36171009056).

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

21152612320 is a wasteful number, since it uses less digits than its factorization.

21152612320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69984 (or 69976 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 21152612320 in words is "twenty-one billion, one hundred fifty-two million, six hundred twelve thousand, three hundred twenty".