21878556930 has 48 divisors (see below), whose sum is σ = 56909806200. Its totient is φ = 5831660544.

The previous prime is 21878556923. The next prime is 21878556949. The reversal of 21878556930 is 3965587812.

21878556930 is a `hidden beast` number, since 2 + 1 + 8 + 78 + 5 + 569 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20873603529 + 1004953401 = 144477^2 + 31701^2 .

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, 151096 + ... + 258044.

Almost surely, 2^21878556930 is an apocalyptic number.

21878556930 is an abundant number, since it is smaller than the sum of its proper divisors (35031249270).

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

21878556930 is a wasteful number, since it uses less digits than its factorization.

21878556930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109235 (or 109232 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 21878556930 in words is "twenty-one billion, eight hundred seventy-eight million, five hundred fifty-six thousand, nine hundred thirty".