21202313131321 has 4 divisors (see below), whose sum is σ = 24231215007232. Its totient is φ = 18173411255412.

The previous prime is 21202313131319. The next prime is 21202313131333. The reversal of 21202313131321 is 12313131320212.

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 not a de Polignac number, because 21202313131321 - 2¹ = 21202313131319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202313131421) 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, 1514450937945 + ... + 1514450937958.

It is an arithmetic number, because the mean of its divisors is an integer number (6057803751808).

Almost surely, 2^{21202313131321} is an apocalyptic number.

It is an amenable number.

21202313131321 is a deficient number, since it is larger than the sum of its proper divisors (3028901875911).

21202313131321 is an equidigital number, since it uses as much as digits as its factorization.

21202313131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028901875910.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21202313131321 its reverse (12313131320212), we get a palindrome (33515444451533).

The spelling of 21202313131321 in words is "twenty-one trillion, two hundred two billion, three hundred thirteen million, one hundred thirty-one thousand, three hundred twenty-one".