31224143221 has 16 divisors (see below), whose sum is σ = 33086448000. Its totient is φ = 29384036928.

The previous prime is 31224143213. The next prime is 31224143239. The reversal of 31224143221 is 12234142213.

It is a cyclic number.

It is not a de Polignac number, because 31224143221 - 2³ = 31224143213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31224143021) 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, 4489855 + ... + 4496803.

It is an arithmetic number, because the mean of its divisors is an integer number (2067903000).

Almost surely, 2^31224143221 is an apocalyptic number.

It is an amenable number.

31224143221 is a deficient number, since it is larger than the sum of its proper divisors (1862304779).

31224143221 is a wasteful number, since it uses less digits than its factorization.

31224143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508.

The product of its digits is 2304, while the sum is 25.

Adding to 31224143221 its reverse (12234142213), we get a palindrome (43458285434).

The spelling of 31224143221 in words is "thirty-one billion, two hundred twenty-four million, one hundred forty-three thousand, two hundred twenty-one".