21645167043376 has 40 divisors (see below), whose sum is σ = 42879776322240. Its totient is φ = 10579955710464.

The previous prime is 21645167043323. The next prime is 21645167043403. The reversal of 21645167043376 is 67334076154612.

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 7 ways as a sum of consecutive naturals, for example, 16148691 + ... + 17437618.

It is an arithmetic number, because the mean of its divisors is an integer number (1071994408056).

Almost surely, 2^{21645167043376} is an apocalyptic number.

It is an amenable number.

21645167043376 is a deficient number, since it is larger than the sum of its proper divisors (21234609278864).

21645167043376 is a wasteful number, since it uses less digits than its factorization.

21645167043376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33587221 (or 33587215 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 21645167043376 in words is "twenty-one trillion, six hundred forty-five billion, one hundred sixty-seven million, forty-three thousand, three hundred seventy-six".