21288495525180 has 96 divisors (see below), whose sum is σ = 64199004710400. Its totient is φ = 5239755026688.

The previous prime is 21288495525173. The next prime is 21288495525247. The reversal of 21288495525180 is 8152559488212.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 7105681 + ... + 9647159.

It is an arithmetic number, because the mean of its divisors is an integer number (668739632400).

Almost surely, 2^{21288495525180} is an apocalyptic number.

21288495525180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21288495525180 is an abundant number, since it is smaller than the sum of its proper divisors (42910509185220).

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

21288495525180 is a wasteful number, since it uses less digits than its factorization.

21288495525180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552243 (or 2552241 counting only the distinct ones).

The product of its (nonzero) digits is 18432000, while the sum is 60.

The spelling of 21288495525180 in words is "twenty-one trillion, two hundred eighty-eight billion, four hundred ninety-five million, five hundred twenty-five thousand, one hundred eighty".