21879280544 has 48 divisors (see below), whose sum is σ = 47328896160. Its totient is φ = 9873557760.

The previous prime is 21879280531. The next prime is 21879280561. The reversal of 21879280544 is 44508297812.

It is a junction number, because it is equal to n+sod(n) for n = 21879280492 and 21879280501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174659 + ... + 272514.

It is an arithmetic number, because the mean of its divisors is an integer number (986018670).

Almost surely, 2^21879280544 is an apocalyptic number.

It is an amenable number.

21879280544 is an abundant number, since it is smaller than the sum of its proper divisors (25449615616).

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

21879280544 is a wasteful number, since it uses less digits than its factorization.

21879280544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447333 (or 447325 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 21879280544 in words is "twenty-one billion, eight hundred seventy-nine million, two hundred eighty thousand, five hundred forty-four".