31221024125 has 16 divisors (see below), whose sum is σ = 38974411008. Its totient is φ = 24970042000.

The previous prime is 31221024083. The next prime is 31221024139. The reversal of 31221024125 is 52142012213.

It is not a de Polignac number, because 31221024125 - 2²² = 31216829821 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 31221024125.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 456944 + ... + 520806.

It is an arithmetic number, because the mean of its divisors is an integer number (2435900688).

Almost surely, 2^31221024125 is an apocalyptic number.

It is an amenable number.

31221024125 is a deficient number, since it is larger than the sum of its proper divisors (7753386883).

31221024125 is an equidigital number, since it uses as much as digits as its factorization.

31221024125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67789 (or 67779 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31221024125 its reverse (52142012213), we get a palindrome (83363036338).

The spelling of 31221024125 in words is "thirty-one billion, two hundred twenty-one million, twenty-four thousand, one hundred twenty-five".