31201023131321 has 2 divisors, whose sum is σ = 31201023131322. Its totient is φ = 31201023131320.

The previous prime is 31201023131251. The next prime is 31201023131347. The reversal of 31201023131321 is 12313132010213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16969983647296 + 14231039484025 = 4119464^2 + 3772405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31201023131321 is a prime.

It is a super-2 number, since 2×31201023131321² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31201023131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600511565660 + 15600511565661.

It is an arithmetic number, because the mean of its divisors is an integer number (15600511565661).

Almost surely, 2^{31201023131321} is an apocalyptic number.

It is an amenable number.

31201023131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201023131321 is an equidigital number, since it uses as much as digits as its factorization.

31201023131321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31201023131321 its reverse (12313132010213), we get a palindrome (43514155141534).

The spelling of 31201023131321 in words is "thirty-one trillion, two hundred one billion, twenty-three million, one hundred thirty-one thousand, three hundred twenty-one".