31223433140221 has 6 divisors (see below), whose sum is σ = 36321136510110. Its totient is φ = 26762942691576.

The previous prime is 31223433140173. The next prime is 31223433140239. The reversal of 31223433140221 is 12204133432213.

It can be written as a sum of positive squares in only one way, i.e., 28454916519225 + 2768516620996 = 5334315^2 + 1663886^2 .

It is not a de Polignac number, because 31223433140221 - 2⁷ = 31223433140093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223433140321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 318606460566 + ... + 318606460663.

It is an arithmetic number, because the mean of its divisors is an integer number (6053522751685).

Almost surely, 2^{31223433140221} is an apocalyptic number.

It is an amenable number.

31223433140221 is a deficient number, since it is larger than the sum of its proper divisors (5097703369889).

31223433140221 is an equidigital number, since it uses as much as digits as its factorization.

31223433140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637212921243 (or 637212921236 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 31223433140221 its reverse (12204133432213), we get a palindrome (43427566572434).

The spelling of 31223433140221 in words is "thirty-one trillion, two hundred twenty-three billion, four hundred thirty-three million, one hundred forty thousand, two hundred twenty-one".