21576927787816 has 32 divisors (see below), whose sum is σ = 40608195264000. Its totient is φ = 10748077811136.

The previous prime is 21576927787813. The next prime is 21576927787819. The reversal of 21576927787816 is 61878772967512.

It is an interprime number because it is at equal distance from previous prime (21576927787813) and next prime (21576927787819).

It is not an unprimeable number, because it can be changed into a prime (21576927787813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100363045 + ... + 100577803.

It is an arithmetic number, because the mean of its divisors is an integer number (1269006102000).

Almost surely, 2^{21576927787816} is an apocalyptic number.

It is an amenable number.

21576927787816 is a deficient number, since it is larger than the sum of its proper divisors (19031267476184).

21576927787816 is a wasteful number, since it uses less digits than its factorization.

21576927787816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261721 (or 261717 counting only the distinct ones).

The product of its digits is 995742720, while the sum is 76.

The spelling of 21576927787816 in words is "twenty-one trillion, five hundred seventy-six billion, nine hundred twenty-seven million, seven hundred eighty-seven thousand, eight hundred sixteen".