21873332757978 has 24 divisors (see below), whose sum is σ = 51037776435828. Its totient is φ = 6730256233152.

The previous prime is 21873332757961. The next prime is 21873332758027. The reversal of 21873332757978 is 87975723337812.

21873332757978 is a `hidden beast` number, since 2 + 18 + 7 + 3 + 3 + 32 + 7 + 579 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19187054371809 + 2686278386169 = 4380303^2 + 1638987^2 .

It is an unprimeable number.

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, 46737890275 + ... + 46737890742.

Almost surely, 2^{21873332757978} is an apocalyptic number.

21873332757978 is an abundant number, since it is smaller than the sum of its proper divisors (29164443677850).

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

21873332757978 is a wasteful number, since it uses less digits than its factorization.

21873332757978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93475781038 (or 93475781035 counting only the distinct ones).

The product of its digits is 746807040, while the sum is 72.

The spelling of 21873332757978 in words is "twenty-one trillion, eight hundred seventy-three billion, three hundred thirty-two million, seven hundred fifty-seven thousand, nine hundred seventy-eight".