21874858615872 has 196 divisors, whose sum is σ = 67181539008256. Its totient is φ = 7056405538560.

The previous prime is 21874858615861. The next prime is 21874858615891. The reversal of 21874858615872 is 27851685847812.

21874858615872 is a `hidden beast` number, since 2 + 1 + 8 + 7 + 485 + 8 + 61 + 5 + 87 + 2 = 666.

21874858615872 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 21874858615872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6115828 + ... + 9008499.

Almost surely, 2^{21874858615872} is an apocalyptic number.

It is an amenable number.

21874858615872 is an abundant number, since it is smaller than the sum of its proper divisors (45306680392384).

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

21874858615872 is an equidigital number, since it uses as much as digits as its factorization.

21874858615872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15124388 (or 15124363 counting only the distinct ones).

The product of its digits is 481689600, while the sum is 72.

The spelling of 21874858615872 in words is "twenty-one trillion, eight hundred seventy-four billion, eight hundred fifty-eight million, six hundred fifteen thousand, eight hundred seventy-two".