31232021222221 has 8 divisors (see below), whose sum is σ = 31395678919704. Its totient is φ = 31068415237440.

The previous prime is 31232021222183. The next prime is 31232021222239. The reversal of 31232021222221 is 12222212023213.

It can be written as a sum of positive squares in 4 ways, for example, as 17380144102500 + 13851877119721 = 4168950^2 + 3721811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31232021222221 - 2²⁵ = 31231987667789 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 (31232021222321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11716810 + ... + 14133211.

It is an arithmetic number, because the mean of its divisors is an integer number (3924459864963).

Almost surely, 2^{31232021222221} is an apocalyptic number.

It is an amenable number.

31232021222221 is a deficient number, since it is larger than the sum of its proper divisors (163657697483).

31232021222221 is a wasteful number, since it uses less digits than its factorization.

31232021222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25856351.

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

Adding to 31232021222221 its reverse (12222212023213), we get a palindrome (43454233245434).

The spelling of 31232021222221 in words is "thirty-one trillion, two hundred thirty-two billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".