21750856001361 has 12 divisors (see below), whose sum is σ = 31423700914320. Its totient is φ = 14497894759320.

The previous prime is 21750856001339. The next prime is 21750856001383. The reversal of 21750856001361 is 16310065805712.

21750856001361 is a `hidden beast` number, since 2 + 1 + 7 + 5 + 0 + 8 + 5 + 600 + 1 + 36 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21750856001339) and next prime (21750856001383).

It is not a de Polignac number, because 21750856001361 - 2¹⁵ = 21750855968593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21750856001261) 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 11 ways as a sum of consecutive naturals, for example, 222940875 + ... + 223038416.

It is an arithmetic number, because the mean of its divisors is an integer number (2618641742860).

Almost surely, 2^{21750856001361} is an apocalyptic number.

It is an amenable number.

21750856001361 is a deficient number, since it is larger than the sum of its proper divisors (9672844912959).

21750856001361 is a wasteful number, since it uses less digits than its factorization.

21750856001361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445984716 (or 445984713 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 21750856001361 in words is "twenty-one trillion, seven hundred fifty billion, eight hundred fifty-six million, one thousand, three hundred sixty-one".