31013232323221 has 4 divisors (see below), whose sum is σ = 32082654127500. Its totient is φ = 29943810518944.

The previous prime is 31013232323207. The next prime is 31013232323237. The reversal of 31013232323221 is 12232323231013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23946939260721 + 7066293062500 = 4893561^2 + 2658250^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013232323221 - 2⁷ = 31013232323093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31013232323221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013232323621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534710902096 + ... + 534710902153.

It is an arithmetic number, because the mean of its divisors is an integer number (8020663531875).

Almost surely, 2^{31013232323221} is an apocalyptic number.

It is an amenable number.

31013232323221 is a deficient number, since it is larger than the sum of its proper divisors (1069421804279).

31013232323221 is a wasteful number, since it uses less digits than its factorization.

31013232323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069421804278.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 31013232323221 its reverse (12232323231013), we get a palindrome (43245555554234).

The spelling of 31013232323221 in words is "thirty-one trillion, thirteen billion, two hundred thirty-two million, three hundred twenty-three thousand, two hundred twenty-one".