31320330211221 has 4 divisors (see below), whose sum is σ = 41760440281632. Its totient is φ = 20880220140812.

The previous prime is 31320330211217. The next prime is 31320330211241. The reversal of 31320330211221 is 12211203302313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31320330211221 - 2² = 31320330211217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31320330211191 and 31320330211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320330211241) 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, 5220055035201 + ... + 5220055035206.

It is an arithmetic number, because the mean of its divisors is an integer number (10440110070408).

Almost surely, 2^{31320330211221} is an apocalyptic number.

It is an amenable number.

31320330211221 is a deficient number, since it is larger than the sum of its proper divisors (10440110070411).

31320330211221 is a wasteful number, since it uses less digits than its factorization.

31320330211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440110070410.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 31320330211221 its reverse (12211203302313), we get a palindrome (43531533513534).

The spelling of 31320330211221 in words is "thirty-one trillion, three hundred twenty billion, three hundred thirty million, two hundred eleven thousand, two hundred twenty-one".