311331004221 has 16 divisors (see below), whose sum is σ = 421941104384. Its totient is φ = 204152949504.

The previous prime is 311331004217. The next prime is 311331004253. The reversal of 311331004221 is 122400133113.

It is not a de Polignac number, because 311331004221 - 2² = 311331004217 is a prime.

It is a super-3 number, since 3×311331004221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311331004321) 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, 1856416 + ... + 2017161.

It is an arithmetic number, because the mean of its divisors is an integer number (26371319024).

Almost surely, 2^311331004221 is an apocalyptic number.

It is an amenable number.

311331004221 is a deficient number, since it is larger than the sum of its proper divisors (110610100163).

311331004221 is a wasteful number, since it uses less digits than its factorization.

311331004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874020.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311331004221 its reverse (122400133113), we get a palindrome (433731137334).

The spelling of 311331004221 in words is "three hundred eleven billion, three hundred thirty-one million, four thousand, two hundred twenty-one".