21877919798472 has 48 divisors (see below), whose sum is σ = 59262841394640. Its totient is φ = 7291391694048.

The previous prime is 21877919798437. The next prime is 21877919798477. The reversal of 21877919798472 is 27489791977812.

21877919798472 is a `hidden beast` number, since 2 + 1 + 8 + 7 + 79 + 1 + 9 + 79 + 8 + 472 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21877919798391 and 21877919798400.

It is not an unprimeable number, because it can be changed into a prime (21877919798477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25581358 + ... + 26422749.

It is an arithmetic number, because the mean of its divisors is an integer number (1234642529055).

Almost surely, 2^{21877919798472} is an apocalyptic number.

It is an amenable number.

21877919798472 is an abundant number, since it is smaller than the sum of its proper divisors (37384921596168).

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

21877919798472 is a wasteful number, since it uses less digits than its factorization.

21877919798472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52009962 (or 52009955 counting only the distinct ones).

The product of its digits is 1792336896, while the sum is 81.

The spelling of 21877919798472 in words is "twenty-one trillion, eight hundred seventy-seven billion, nine hundred nineteen million, seven hundred ninety-eight thousand, four hundred seventy-two".