21612634374531 has 8 divisors (see below), whose sum is σ = 28819735358800. Its totient is φ = 14406978153312.

The previous prime is 21612634374521. The next prime is 21612634374533. The reversal of 21612634374531 is 13547343621612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21612634374531 is a prime.

It is a super-2 number, since 2×21612634374531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21612634374533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361155856 + ... + 361215693.

It is an arithmetic number, because the mean of its divisors is an integer number (3602466919850).

Almost surely, 2^{21612634374531} is an apocalyptic number.

21612634374531 is a deficient number, since it is larger than the sum of its proper divisors (7207100984269).

21612634374531 is an equidigital number, since it uses as much as digits as its factorization.

21612634374531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722381525.

The product of its digits is 2177280, while the sum is 48.

The spelling of 21612634374531 in words is "twenty-one trillion, six hundred twelve billion, six hundred thirty-four million, three hundred seventy-four thousand, five hundred thirty-one".