31230013121 has 4 divisors (see below), whose sum is σ = 31265222592. Its totient is φ = 31194803652.

The previous prime is 31230013109. The next prime is 31230013201. The reversal of 31230013121 is 12131003213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31230013121 - 2⁶ = 31230013057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31230013121.

It is not an unprimeable number, because it can be changed into a prime (31230013621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17603405 + ... + 17605178.

It is an arithmetic number, because the mean of its divisors is an integer number (7816305648).

Almost surely, 2^31230013121 is an apocalyptic number.

It is an amenable number.

31230013121 is a deficient number, since it is larger than the sum of its proper divisors (35209471).

31230013121 is an equidigital number, since it uses as much as digits as its factorization.

31230013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35209470.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31230013121 its reverse (12131003213), we get a palindrome (43361016334).

The spelling of 31230013121 in words is "thirty-one billion, two hundred thirty million, thirteen thousand, one hundred twenty-one".