31323112121 has 16 divisors (see below), whose sum is σ = 36195744000. Its totient is φ = 26551533888.

The previous prime is 31323112091. The next prime is 31323112127. The reversal of 31323112121 is 12121132313.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323112121 is a prime.

It is a super-2 number, since 2×31323112121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31323112093 and 31323112102.

It is not an unprimeable number, because it can be changed into a prime (31323112127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173276 + ... + 304418.

It is an arithmetic number, because the mean of its divisors is an integer number (2262234000).

Almost surely, 2^31323112121 is an apocalyptic number.

It is an amenable number.

31323112121 is a deficient number, since it is larger than the sum of its proper divisors (4872631879).

31323112121 is a wasteful number, since it uses less digits than its factorization.

31323112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131528.

The product of its digits is 216, while the sum is 20.

Adding to 31323112121 its reverse (12121132313), we get a palindrome (43444244434).

The spelling of 31323112121 in words is "thirty-one billion, three hundred twenty-three million, one hundred twelve thousand, one hundred twenty-one".