31012110121 has 2 divisors, whose sum is σ = 31012110122. Its totient is φ = 31012110120.

The previous prime is 31012110097. The next prime is 31012110127. The reversal of 31012110121 is 12101121013.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26190890896 + 4821219225 = 161836^2 + 69435^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012110121 - 2¹⁵ = 31012077353 is a prime.

It is not a weakly prime, because it can be changed into another prime (31012110127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506055060 + 15506055061.

It is an arithmetic number, because the mean of its divisors is an integer number (15506055061).

Almost surely, 2^31012110121 is an apocalyptic number.

It is an amenable number.

31012110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012110121 is an equidigital number, since it uses as much as digits as its factorization.

31012110121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31012110121 its reverse (12101121013), we get a palindrome (43113231134).

The spelling of 31012110121 in words is "thirty-one billion, twelve million, one hundred ten thousand, one hundred twenty-one".