31123133321 has 16 divisors (see below), whose sum is σ = 35635756800. Its totient is φ = 26627185728.

The previous prime is 31123133317. The next prime is 31123133339. The reversal of 31123133321 is 12333132113.

It is a cyclic number.

It is not a de Polignac number, because 31123133321 - 2² = 31123133317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31123133311) 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, 15338135 + ... + 15340163.

It is an arithmetic number, because the mean of its divisors is an integer number (2227234800).

Almost surely, 2^31123133321 is an apocalyptic number.

It is an amenable number.

31123133321 is a deficient number, since it is larger than the sum of its proper divisors (4512623479).

31123133321 is a wasteful number, since it uses less digits than its factorization.

31123133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5048.

The product of its digits is 972, while the sum is 23.

Adding to 31123133321 its reverse (12333132113), we get a palindrome (43456265434).

The spelling of 31123133321 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty-one".