31320311201221 has 16 divisors (see below), whose sum is σ = 35804401649280. Its totient is φ = 26838661893120.

The previous prime is 31320311201219. The next prime is 31320311201239. The reversal of 31320311201221 is 12210211302313.

It is not a de Polignac number, because 31320311201221 - 2¹ = 31320311201219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320311201192 and 31320311201201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320311201821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426327790 + ... + 426401248.

It is an arithmetic number, because the mean of its divisors is an integer number (2237775103080).

Almost surely, 2^{31320311201221} is an apocalyptic number.

It is an amenable number.

31320311201221 is a deficient number, since it is larger than the sum of its proper divisors (4484090448059).

31320311201221 is an equidigital number, since it uses as much as digits as its factorization.

31320311201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89244.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31320311201221 its reverse (12210211302313), we get a palindrome (43530522503534).

The spelling of 31320311201221 in words is "thirty-one trillion, three hundred twenty billion, three hundred eleven million, two hundred one thousand, two hundred twenty-one".