21878776281900 has 72 divisors (see below), whose sum is σ = 63343355547024. Its totient is φ = 5830583398400.

The previous prime is 21878776281899. The next prime is 21878776281913. The reversal of 21878776281900 is 918267787812.

It is a super-2 number, since 2×21878776281900² (a number of 27 digits) contains 22 as substring.

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, 23014221 + ... + 23946020.

It is an arithmetic number, because the mean of its divisors is an integer number (879768827042).

Almost surely, 2^{21878776281900} is an apocalyptic number.

21878776281900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21878776281900 is an abundant number, since it is smaller than the sum of its proper divisors (41464579265124).

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

21878776281900 is a wasteful number, since it uses less digits than its factorization.

21878776281900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46961811 (or 46961804 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 66.

The spelling of 21878776281900 in words is "twenty-one trillion, eight hundred seventy-eight billion, seven hundred seventy-six million, two hundred eighty-one thousand, nine hundred".