21537378980088 has 64 divisors (see below), whose sum is σ = 56249975577600. Its totient is φ = 6863836266240.

The previous prime is 21537378980077. The next prime is 21537378980093. The reversal of 21537378980088 is 88008987373512.

It is a super-3 number, since 3×21537378980088³ (a number of 41 digits) contains 333 as substring.

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, 174324333 + ... + 174447836.

It is an arithmetic number, because the mean of its divisors is an integer number (878905868400).

Almost surely, 2^{21537378980088} is an apocalyptic number.

It is an amenable number.

21537378980088 is an abundant number, since it is smaller than the sum of its proper divisors (34712596597512).

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

21537378980088 is a wasteful number, since it uses less digits than its factorization.

21537378980088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348772292 (or 348772288 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 69.

The spelling of 21537378980088 in words is "twenty-one trillion, five hundred thirty-seven billion, three hundred seventy-eight million, nine hundred eighty thousand, eighty-eight".