31220322331225 has 24 divisors (see below), whose sum is σ = 39962529734400. Its totient is φ = 24170259336000.

The previous prime is 31220322331207. The next prime is 31220322331313. The reversal of 31220322331225 is 52213322302213.

It is not a de Polignac number, because 31220322331225 - 2¹¹ = 31220322329177 is a prime.

It is a super-2 number, since 2×31220322331225² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 72906990 + ... + 73333960.

It is an arithmetic number, because the mean of its divisors is an integer number (1665105405600).

Almost surely, 2^{31220322331225} is an apocalyptic number.

It is an amenable number.

31220322331225 is a deficient number, since it is larger than the sum of its proper divisors (8742207403175).

31220322331225 is a wasteful number, since it uses less digits than its factorization.

31220322331225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521361 (or 521356 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 31220322331225 its reverse (52213322302213), we get a palindrome (83433644633438).

The spelling of 31220322331225 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty-two million, three hundred thirty-one thousand, two hundred twenty-five".