31221225321 has 16 divisors (see below), whose sum is σ = 48905976000. Its totient is φ = 17466419520.

The previous prime is 31221225307. The next prime is 31221225323. The reversal of 31221225321 is 12352212213.

It is not a de Polignac number, because 31221225321 - 2⁵ = 31221225289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31221225291 and 31221225300.

It is not an unprimeable number, because it can be changed into a prime (31221225323) by changing a digit.

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, 36387946 + ... + 36388803.

It is an arithmetic number, because the mean of its divisors is an integer number (3056623500).

Almost surely, 2^31221225321 is an apocalyptic number.

It is an amenable number.

31221225321 is a deficient number, since it is larger than the sum of its proper divisors (17684750679).

31221225321 is a wasteful number, since it uses less digits than its factorization.

31221225321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72776776.

The product of its digits is 1440, while the sum is 24.

Adding to 31221225321 its reverse (12352212213), we get a palindrome (43573437534).

The spelling of 31221225321 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-five thousand, three hundred twenty-one".