31119225721 has 16 divisors (see below), whose sum is σ = 33473456640. Its totient is φ = 28864563840.

The previous prime is 31119225703. The next prime is 31119225733. The reversal of 31119225721 is 12752291113.

It is a cyclic number.

It is not a de Polignac number, because 31119225721 - 2⁷ = 31119225593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31119225751) 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, 3171 + ... + 249496.

It is an arithmetic number, because the mean of its divisors is an integer number (2092091040).

Almost surely, 2^31119225721 is an apocalyptic number.

31119225721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31119225721 is a deficient number, since it is larger than the sum of its proper divisors (2354230919).

31119225721 is a wasteful number, since it uses less digits than its factorization.

31119225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252864.

The product of its digits is 7560, while the sum is 34.

The spelling of 31119225721 in words is "thirty-one billion, one hundred nineteen million, two hundred twenty-five thousand, seven hundred twenty-one".