31320123302021 has 4 divisors (see below), whose sum is σ = 31643011171212. Its totient is φ = 30997235432832.

The previous prime is 31320123301891. The next prime is 31320123302051. The reversal of 31320123302021 is 12020332102313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15832639950625 + 15487483351396 = 3979025^2 + 3935414^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320123302021 - 2¹⁰ = 31320123300997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320123302051) 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, 161443934450 + ... + 161443934643.

It is an arithmetic number, because the mean of its divisors is an integer number (7910752792803).

Almost surely, 2^{31320123302021} is an apocalyptic number.

It is an amenable number.

31320123302021 is a deficient number, since it is larger than the sum of its proper divisors (322887869191).

31320123302021 is an equidigital number, since it uses as much as digits as its factorization.

31320123302021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322887869190.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31320123302021 its reverse (12020332102313), we get a palindrome (43340455404334).

The spelling of 31320123302021 in words is "thirty-one trillion, three hundred twenty billion, one hundred twenty-three million, three hundred two thousand, twenty-one".