21313130321031 has 4 divisors (see below), whose sum is σ = 28417507094712. Its totient is φ = 14208753547352.

The previous prime is 21313130321011. The next prime is 21313130321057. The reversal of 21313130321031 is 13012303131312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21313130321031 - 2²² = 21313126126727 is a prime.

It is a super-2 number, since 2×21313130321031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21313130320992 and 21313130321010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313130321011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3552188386836 + ... + 3552188386841.

It is an arithmetic number, because the mean of its divisors is an integer number (7104376773678).

Almost surely, 2^{21313130321031} is an apocalyptic number.

21313130321031 is a deficient number, since it is larger than the sum of its proper divisors (7104376773681).

21313130321031 is an equidigital number, since it uses as much as digits as its factorization.

21313130321031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104376773680.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21313130321031 its reverse (13012303131312), we get a palindrome (34325433452343).

The spelling of 21313130321031 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirty million, three hundred twenty-one thousand, thirty-one".