31113200121 has 16 divisors (see below), whose sum is σ = 42181460928. Its totient is φ = 20393812800.

The previous prime is 31113200077. The next prime is 31113200141. The reversal of 31113200121 is 12100231113.

It is a happy number.

It is not a de Polignac number, because 31113200121 - 2⁷ = 31113199993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31113200121.

It is not an unprimeable number, because it can be changed into a prime (31113200141) 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, 434686 + ... + 501176.

It is an arithmetic number, because the mean of its divisors is an integer number (2636341308).

Almost surely, 2^31113200121 is an apocalyptic number.

It is an amenable number.

31113200121 is a deficient number, since it is larger than the sum of its proper divisors (11068260807).

31113200121 is a wasteful number, since it uses less digits than its factorization.

31113200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69112.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31113200121 its reverse (12100231113), we get a palindrome (43213431234).

The spelling of 31113200121 in words is "thirty-one billion, one hundred thirteen million, two hundred thousand, one hundred twenty-one".