31121012121 has 16 divisors (see below), whose sum is σ = 42933172800. Its totient is φ = 20028351168.

The previous prime is 31121012113. The next prime is 31121012149. The reversal of 31121012121 is 12121012113.

It is not a de Polignac number, because 31121012121 - 2³ = 31121012113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31121012121.

It is not an unprimeable number, because it can be changed into a prime (31121012101) 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 15 ways as a sum of consecutive naturals, for example, 513210 + ... + 570636.

It is an arithmetic number, because the mean of its divisors is an integer number (2683323300).

Almost surely, 2^31121012121 is an apocalyptic number.

It is an amenable number.

31121012121 is a deficient number, since it is larger than the sum of its proper divisors (11812160679).

31121012121 is a wasteful number, since it uses less digits than its factorization.

31121012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63688.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 31121012121 its reverse (12121012113), we get a palindrome (43242024234).

The spelling of 31121012121 in words is "thirty-one billion, one hundred twenty-one million, twelve thousand, one hundred twenty-one".