311331020221 has 8 divisors (see below), whose sum is σ = 338413015584. Its totient is φ = 284696661360.

The previous prime is 311331020213. The next prime is 311331020233. The reversal of 311331020221 is 122020133113.

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 311331020221 - 2³ = 311331020213 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 (311331020621) 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, 111907675 + ... + 111910456.

It is an arithmetic number, because the mean of its divisors is an integer number (42301626948).

Almost surely, 2^311331020221 is an apocalyptic number.

It is an amenable number.

311331020221 is a deficient number, since it is larger than the sum of its proper divisors (27081995363).

311331020221 is a wasteful number, since it uses less digits than its factorization.

311331020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223818251.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 311331020221 its reverse (122020133113), we get a palindrome (433351153334).

The spelling of 311331020221 in words is "three hundred eleven billion, three hundred thirty-one million, twenty thousand, two hundred twenty-one".