21159960258388 has 72 divisors (see below), whose sum is σ = 44024717930816. Its totient is φ = 8715318543360.

The previous prime is 21159960258379. The next prime is 21159960258433. The reversal of 21159960258388 is 88385206995112.

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201381 + ... + 6508492.

Almost surely, 2^{21159960258388} is an apocalyptic number.

21159960258388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21159960258388 is an abundant number, since it is smaller than the sum of its proper divisors (22864757672428).

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

21159960258388 is a wasteful number, since it uses less digits than its factorization.

21159960258388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710033 (or 6709990 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 67.

The spelling of 21159960258388 in words is "twenty-one trillion, one hundred fifty-nine billion, nine hundred sixty million, two hundred fifty-eight thousand, three hundred eighty-eight".