31231442121 has 16 divisors (see below), whose sum is σ = 45477027840. Its totient is φ = 18907531920.

The previous prime is 31231442117. The next prime is 31231442141. The reversal of 31231442121 is 12124413213.

It is not a de Polignac number, because 31231442121 - 2² = 31231442117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31231442091 and 31231442100.

It is not an unprimeable number, because it can be changed into a prime (31231442111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484585 + ... + 545238.

It is an arithmetic number, because the mean of its divisors is an integer number (2842314240).

Almost surely, 2^31231442121 is an apocalyptic number.

It is an amenable number.

31231442121 is a deficient number, since it is larger than the sum of its proper divisors (14245585719).

31231442121 is a wasteful number, since it uses less digits than its factorization.

31231442121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030756.

The product of its digits is 1152, while the sum is 24.

Adding to 31231442121 its reverse (12124413213), we get a palindrome (43355855334).

The spelling of 31231442121 in words is "thirty-one billion, two hundred thirty-one million, four hundred forty-two thousand, one hundred twenty-one".