31330113112021 has 2 divisors, whose sum is σ = 31330113112022. Its totient is φ = 31330113112020.

The previous prime is 31330113112019. The next prime is 31330113112099. The reversal of 31330113112021 is 12021131103313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31242633219121 + 87479892900 = 5589511^2 + 295770^2 .

It is a cyclic number.

It is not a de Polignac number, because 31330113112021 - 2¹ = 31330113112019 is a prime.

It is a super-2 number, since 2×31330113112021² (a number of 28 digits) contains 22 as substring.

Together with 31330113112019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31330113111983 and 31330113112001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31330113112321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665056556010 + 15665056556011.

It is an arithmetic number, because the mean of its divisors is an integer number (15665056556011).

Almost surely, 2^{31330113112021} is an apocalyptic number.

It is an amenable number.

31330113112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31330113112021 is an equidigital number, since it uses as much as digits as its factorization.

31330113112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31330113112021 its reverse (12021131103313), we get a palindrome (43351244215334).

The spelling of 31330113112021 in words is "thirty-one trillion, three hundred thirty billion, one hundred thirteen million, one hundred twelve thousand, twenty-one".