21310144312313 has 4 divisors (see below), whose sum is σ = 21310751768208. Its totient is φ = 21309536856420.

The previous prime is 21310144312309. The next prime is 21310144312349. The reversal of 21310144312313 is 31321344101312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21310144312313 - 2² = 21310144312309 is a prime.

It is a super-2 number, since 2×21310144312313² (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 (21310144332313) 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, 303675323 + ... + 303745488.

It is an arithmetic number, because the mean of its divisors is an integer number (5327687942052).

Almost surely, 2^{21310144312313} is an apocalyptic number.

It is an amenable number.

21310144312313 is a deficient number, since it is larger than the sum of its proper divisors (607455895).

21310144312313 is an equidigital number, since it uses as much as digits as its factorization.

21310144312313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607455894.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 21310144312313 its reverse (31321344101312), we get a palindrome (52631488413625).

The spelling of 21310144312313 in words is "twenty-one trillion, three hundred ten billion, one hundred forty-four million, three hundred twelve thousand, three hundred thirteen".