311221322121 has 8 divisors (see below), whose sum is σ = 414989960544. Its totient is φ = 207466782560.

The previous prime is 311221322033. The next prime is 311221322161. The reversal of 311221322121 is 121223122113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311221322121 is a prime.

It is a super-2 number, since 2×311221322121² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311221322161) 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, 3473100 + ... + 3561581.

It is an arithmetic number, because the mean of its divisors is an integer number (51873745068).

Almost surely, 2^311221322121 is an apocalyptic number.

It is an amenable number.

311221322121 is a deficient number, since it is larger than the sum of its proper divisors (103768638423).

311221322121 is a wasteful number, since it uses less digits than its factorization.

311221322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049431.

The product of its digits is 288, while the sum is 21.

Adding to 311221322121 its reverse (121223122113), we get a palindrome (432444444234).

The spelling of 311221322121 in words is "three hundred eleven billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred twenty-one".