21791375392161 has 16 divisors (see below), whose sum is σ = 30324379443840. Its totient is φ = 13893225139200.

The previous prime is 21791375392159. The next prime is 21791375392181. The reversal of 21791375392161 is 16129357319712.

It is not a de Polignac number, because 21791375392161 - 2¹ = 21791375392159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21791375392121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30604416 + ... + 31308353.

It is an arithmetic number, because the mean of its divisors is an integer number (1895273715240).

Almost surely, 2^{21791375392161} is an apocalyptic number.

It is an amenable number.

21791375392161 is a deficient number, since it is larger than the sum of its proper divisors (8533004051679).

21791375392161 is a wasteful number, since it uses less digits than its factorization.

21791375392161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61917896.

The product of its digits is 4286520, while the sum is 57.

The spelling of 21791375392161 in words is "twenty-one trillion, seven hundred ninety-one billion, three hundred seventy-five million, three hundred ninety-two thousand, one hundred sixty-one".