311133123221 has 16 divisors (see below), whose sum is σ = 317252738880. Its totient is φ = 305080110720.

The previous prime is 311133123199. The next prime is 311133123229. The reversal of 311133123221 is 122321331113.

It is a cyclic number.

It is not a de Polignac number, because 311133123221 - 2¹⁰ = 311133122197 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 (311133123229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6664466 + ... + 6710988.

It is an arithmetic number, because the mean of its divisors is an integer number (19828296180).

Almost surely, 2^311133123221 is an apocalyptic number.

It is an amenable number.

311133123221 is a deficient number, since it is larger than the sum of its proper divisors (6119615659).

311133123221 is a wasteful number, since it uses less digits than its factorization.

311133123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47236.

The product of its digits is 648, while the sum is 23.

Adding to 311133123221 its reverse (122321331113), we get a palindrome (433454454334).

The spelling of 311133123221 in words is "three hundred eleven billion, one hundred thirty-three million, one hundred twenty-three thousand, two hundred twenty-one".