21877131206400 has 108 divisors (see below), whose sum is σ = 72199090780152. Its totient is φ = 5833901649920.

The previous prime is 21877131206317. The next prime is 21877131206401. The reversal of 21877131206400 is 460213177812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21877131206401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 569697759 + ... + 569736158.

Almost surely, 2^{21877131206400} is an apocalyptic number.

21877131206400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21877131206400 is an abundant number, since it is smaller than the sum of its proper divisors (50321959573752).

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

21877131206400 is a wasteful number, since it uses less digits than its factorization.

21877131206400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139433946 (or 1139433927 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 21877131206400 in words is "twenty-one trillion, eight hundred seventy-seven billion, one hundred thirty-one million, two hundred six thousand, four hundred".