21631732074431 has 4 divisors (see below), whose sum is σ = 21699970977192. Its totient is φ = 21563493171672.

The previous prime is 21631732074391. The next prime is 21631732074437. The reversal of 21631732074431 is 13447023713612.

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 21631732074431 - 2²⁶ = 21631664965567 is a prime.

It is a super-2 number, since 2×21631732074431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631732074437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34119450905 + ... + 34119451538.

It is an arithmetic number, because the mean of its divisors is an integer number (5424992744298).

Almost surely, 2^{21631732074431} is an apocalyptic number.

21631732074431 is a deficient number, since it is larger than the sum of its proper divisors (68238902761).

21631732074431 is an equidigital number, since it uses as much as digits as its factorization.

21631732074431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68238902760.

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 21631732074431 in words is "twenty-one trillion, six hundred thirty-one billion, seven hundred thirty-two million, seventy-four thousand, four hundred thirty-one".