31108421033 has 2 divisors, whose sum is σ = 31108421034. Its totient is φ = 31108421032.

The previous prime is 31108420991. The next prime is 31108421039. The reversal of 31108421033 is 33012480113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31107082384 + 1338649 = 176372^2 + 1157^2 .

It is an emirp because it is prime and its reverse (33012480113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31108421033 - 2¹⁸ = 31108158889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31108420993 and 31108421011.

It is not a weakly prime, because it can be changed into another prime (31108421039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554210516 + 15554210517.

It is an arithmetic number, because the mean of its divisors is an integer number (15554210517).

Almost surely, 2^31108421033 is an apocalyptic number.

It is an amenable number.

31108421033 is a deficient number, since it is larger than the sum of its proper divisors (1).

31108421033 is an equidigital number, since it uses as much as digits as its factorization.

31108421033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 31108421033 in words is "thirty-one billion, one hundred eight million, four hundred twenty-one thousand, thirty-three".