31221220223224 has 16 divisors (see below), whose sum is σ = 61983304855200. Its totient is φ = 14692338928512.

The previous prime is 31221220223189. The next prime is 31221220223227. The reversal of 31221220223224 is 42232202212213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31221220223192 and 31221220223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221220223227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114783897744 + ... + 114783898015.

It is an arithmetic number, because the mean of its divisors is an integer number (3873956553450).

Almost surely, 2^{31221220223224} is an apocalyptic number.

31221220223224 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

31221220223224 is a deficient number, since it is larger than the sum of its proper divisors (30762084631976).

31221220223224 is a wasteful number, since it uses less digits than its factorization.

31221220223224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229567795782 (or 229567795778 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31221220223224 its reverse (42232202212213), we get a palindrome (73453422435437).

The spelling of 31221220223224 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, two hundred twenty-four".