31221245225 has 12 divisors (see below), whose sum is σ = 38992868880. Its totient is φ = 24797302800.

The previous prime is 31221245219. The next prime is 31221245239. The reversal of 31221245225 is 52254212213.

It is a happy number.

It is not a de Polignac number, because 31221245225 - 2²⁰ = 31220196649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4488791 + ... + 4495740.

It is an arithmetic number, because the mean of its divisors is an integer number (3249405740).

Almost surely, 2^31221245225 is an apocalyptic number.

It is an amenable number.

31221245225 is a deficient number, since it is larger than the sum of its proper divisors (7771623655).

31221245225 is a wasteful number, since it uses less digits than its factorization.

31221245225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984680 (or 8984675 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

Adding to 31221245225 its reverse (52254212213), we get a palindrome (83475457438).

The spelling of 31221245225 in words is "thirty-one billion, two hundred twenty-one million, two hundred forty-five thousand, two hundred twenty-five".