31330312121 has 8 divisors (see below), whose sum is σ = 31423237440. Its totient is φ = 31237520112.

The previous prime is 31330312093. The next prime is 31330312127. The reversal of 31330312121 is 12121303313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31330312121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31330312093 and 31330312102.

It is not an unprimeable number, because it can be changed into a prime (31330312127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447620 + ... + 512858.

It is an arithmetic number, because the mean of its divisors is an integer number (3927904680).

Almost surely, 2^31330312121 is an apocalyptic number.

It is an amenable number.

31330312121 is a deficient number, since it is larger than the sum of its proper divisors (92925319).

31330312121 is an equidigital number, since it uses as much as digits as its factorization.

31330312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66655.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31330312121 its reverse (12121303313), we get a palindrome (43451615434).

The spelling of 31330312121 in words is "thirty-one billion, three hundred thirty million, three hundred twelve thousand, one hundred twenty-one".