31021320203231 has 2 divisors, whose sum is σ = 31021320203232. Its totient is φ = 31021320203230.

The previous prime is 31021320203149. The next prime is 31021320203261. The reversal of 31021320203231 is 13230202312013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31021320203231 - 2²² = 31021316008927 is a prime.

It is a super-2 number, since 2×31021320203231² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31021320203197 and 31021320203206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021320203261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510660101615 + 15510660101616.

It is an arithmetic number, because the mean of its divisors is an integer number (15510660101616).

Almost surely, 2^{31021320203231} is an apocalyptic number.

31021320203231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021320203231 is an equidigital number, since it uses as much as digits as its factorization.

31021320203231 is an evil number, because the sum of its binary digits is even.

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

Adding to 31021320203231 its reverse (13230202312013), we get a palindrome (44251522515244).

The spelling of 31021320203231 in words is "thirty-one trillion, twenty-one billion, three hundred twenty million, two hundred three thousand, two hundred thirty-one".