21567202868 has 12 divisors (see below), whose sum is σ = 38454730020. Its totient is φ = 10580137152.

The previous prime is 21567202837. The next prime is 21567202903. The reversal of 21567202868 is 86820276512.

It can be written as a sum of positive squares in 2 ways, for example, as 13172611984 + 8394590884 = 114772^2 + 91622^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50865833 + ... + 50866256.

It is an arithmetic number, because the mean of its divisors is an integer number (3204560835).

Almost surely, 2^21567202868 is an apocalyptic number.

It is an amenable number.

21567202868 is a deficient number, since it is larger than the sum of its proper divisors (16887527152).

21567202868 is a wasteful number, since it uses less digits than its factorization.

21567202868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101732146 (or 101732144 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 21567202868 in words is "twenty-one billion, five hundred sixty-seven million, two hundred two thousand, eight hundred sixty-eight".