21312340131 has 8 divisors (see below), whose sum is σ = 29077301440. Its totient is φ = 13877802792.

The previous prime is 21312340087. The next prime is 21312340151. The reversal of 21312340131 is 13104321312.

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

It is not a de Polignac number, because 21312340131 - 2⁹ = 21312339619 is a prime.

It is a super-2 number, since 2×21312340131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312340098 and 21312340107.

It is not an unprimeable number, because it can be changed into a prime (21312340151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82605841 + ... + 82606098.

It is an arithmetic number, because the mean of its divisors is an integer number (3634662680).

Almost surely, 2^21312340131 is an apocalyptic number.

21312340131 is a deficient number, since it is larger than the sum of its proper divisors (7764961309).

21312340131 is a wasteful number, since it uses less digits than its factorization.

21312340131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165211985.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21312340131 its reverse (13104321312), we get a palindrome (34416661443).

The spelling of 21312340131 in words is "twenty-one billion, three hundred twelve million, three hundred forty thousand, one hundred thirty-one".