31221430444232 has 16 divisors (see below), whose sum is σ = 66903065237760. Its totient is φ = 13380613047504.

The previous prime is 31221430444201. The next prime is 31221430444261. The reversal of 31221430444232 is 23244403412213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31221430444192 and 31221430444201.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 278762771768 + ... + 278762771879.

It is an arithmetic number, because the mean of its divisors is an integer number (4181441577360).

Almost surely, 2^{31221430444232} is an apocalyptic number.

It is an amenable number.

31221430444232 is an abundant number, since it is smaller than the sum of its proper divisors (35681634793528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221430444232 is a wasteful number, since it uses less digits than its factorization.

31221430444232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557525543660 (or 557525543656 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 31221430444232 its reverse (23244403412213), we get a palindrome (54465833856445).

The spelling of 31221430444232 in words is "thirty-one trillion, two hundred twenty-one billion, four hundred thirty million, four hundred forty-four thousand, two hundred thirty-two".