21312326343624 has 32 divisors (see below), whose sum is σ = 54414450241920. Its totient is φ = 6952957530176.

The previous prime is 21312326343599. The next prime is 21312326343641. The reversal of 21312326343624 is 42634362321312.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9446952039 + ... + 9446954294.

It is an arithmetic number, because the mean of its divisors is an integer number (1700451570060).

Almost surely, 2^{21312326343624} is an apocalyptic number.

21312326343624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21312326343624 is an abundant number, since it is smaller than the sum of its proper divisors (33102123898296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312326343624 is a wasteful number, since it uses less digits than its factorization.

21312326343624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18893906389 (or 18893906385 counting only the distinct ones).

The product of its digits is 746496, while the sum is 42.

Adding to 21312326343624 its reverse (42634362321312), we get a palindrome (63946688664936).

The spelling of 21312326343624 in words is "twenty-one trillion, three hundred twelve billion, three hundred twenty-six million, three hundred forty-three thousand, six hundred twenty-four".