21373714235571 has 4 divisors (see below), whose sum is σ = 28498285647432. Its totient is φ = 14249142823712.

The previous prime is 21373714235567. The next prime is 21373714235579. The reversal of 21373714235571 is 17553241737312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21373714235571 - 2² = 21373714235567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21373714235579) 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 3 ways as a sum of consecutive naturals, for example, 3562285705926 + ... + 3562285705931.

It is an arithmetic number, because the mean of its divisors is an integer number (7124571411858).

Almost surely, 2^{21373714235571} is an apocalyptic number.

21373714235571 is a deficient number, since it is larger than the sum of its proper divisors (7124571411861).

21373714235571 is an equidigital number, since it uses as much as digits as its factorization.

21373714235571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124571411860.

The product of its digits is 3704400, while the sum is 51.

The spelling of 21373714235571 in words is "twenty-one trillion, three hundred seventy-three billion, seven hundred fourteen million, two hundred thirty-five thousand, five hundred seventy-one".