21316099279761 has 144 divisors (see below), whose sum is σ = 37975889757312. Its totient is φ = 11399698252800.

The previous prime is 21316099279757. The next prime is 21316099279777. The reversal of 21316099279761 is 16797299061312.

21316099279761 is a `hidden beast` number, since 2 + 13 + 1 + 609 + 9 + 2 + 7 + 9 + 7 + 6 + 1 = 666.

It is not a de Polignac number, because 21316099279761 - 2² = 21316099279757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21316099279711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 669943525 + ... + 669975341.

It is an arithmetic number, because the mean of its divisors is an integer number (263721456648).

Almost surely, 2^{21316099279761} is an apocalyptic number.

It is an amenable number.

21316099279761 is a deficient number, since it is larger than the sum of its proper divisors (16659790477551).

21316099279761 is a wasteful number, since it uses less digits than its factorization.

21316099279761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33624 (or 33608 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 63.

The spelling of 21316099279761 in words is "twenty-one trillion, three hundred sixteen billion, ninety-nine million, two hundred seventy-nine thousand, seven hundred sixty-one".