31221112225 has 24 divisors (see below), whose sum is σ = 39342481920. Its totient is φ = 24573024000.

The previous prime is 31221112213. The next prime is 31221112267. The reversal of 31221112225 is 52221112213.

It is not a de Polignac number, because 31221112225 - 2⁵ = 31221112193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221112196 and 31221112205.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831865 + ... + 868585.

It is an arithmetic number, because the mean of its divisors is an integer number (1639270080).

Almost surely, 2^31221112225 is an apocalyptic number.

It is an amenable number.

31221112225 is a deficient number, since it is larger than the sum of its proper divisors (8121369695).

31221112225 is a wasteful number, since it uses less digits than its factorization.

31221112225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37281 (or 37276 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

Adding to 31221112225 its reverse (52221112213), we get a palindrome (83442224438).

The spelling of 31221112225 in words is "thirty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-five".