21310221131321 has 4 divisors (see below), whose sum is σ = 22431811717200. Its totient is φ = 20188630545444.

The previous prime is 21310221131273. The next prime is 21310221131357. The reversal of 21310221131321 is 12313112201312.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21310221131321 is a prime.

It is a super-2 number, since 2×21310221131321² (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 (21310221131821) 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, 560795292911 + ... + 560795292948.

It is an arithmetic number, because the mean of its divisors is an integer number (5607952929300).

Almost surely, 2^{21310221131321} is an apocalyptic number.

It is an amenable number.

21310221131321 is a deficient number, since it is larger than the sum of its proper divisors (1121590585879).

21310221131321 is a wasteful number, since it uses less digits than its factorization.

21310221131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121590585878.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21310221131321 its reverse (12313112201312), we get a palindrome (33623333332633).

The spelling of 21310221131321 in words is "twenty-one trillion, three hundred ten billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".