31103311112021 has 2 divisors, whose sum is σ = 31103311112022. Its totient is φ = 31103311112020.

The previous prime is 31103311111979. The next prime is 31103311112047. The reversal of 31103311112021 is 12021111330113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25990674591025 + 5112636520996 = 5098105^2 + 2261114^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103311112021 - 2³⁸ = 30828433205077 is a prime.

It is a super-2 number, since 2×31103311112021² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31103311111984 and 31103311112002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31103311118021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551655556010 + 15551655556011.

It is an arithmetic number, because the mean of its divisors is an integer number (15551655556011).

Almost surely, 2^{31103311112021} is an apocalyptic number.

It is an amenable number.

31103311112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103311112021 is an equidigital number, since it uses as much as digits as its factorization.

31103311112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31103311112021 its reverse (12021111330113), we get a palindrome (43124422442134).

The spelling of 31103311112021 in words is "thirty-one trillion, one hundred three billion, three hundred eleven million, one hundred twelve thousand, twenty-one".