311012111221 has 4 divisors (see below), whose sum is σ = 355442412832. Its totient is φ = 266581809612.

The previous prime is 311012111213. The next prime is 311012111227. The reversal of 311012111221 is 122111210113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122111210113 = 65677 ⋅1859269.

It is a cyclic number.

It is not a de Polignac number, because 311012111221 - 2³ = 311012111213 is a prime.

It is a super-2 number, since 2×311012111221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311012111195 and 311012111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311012111227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22215150795 + ... + 22215150808.

It is an arithmetic number, because the mean of its divisors is an integer number (88860603208).

Almost surely, 2^311012111221 is an apocalyptic number.

It is an amenable number.

311012111221 is a deficient number, since it is larger than the sum of its proper divisors (44430301611).

311012111221 is an equidigital number, since it uses as much as digits as its factorization.

311012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44430301610.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 311012111221 its reverse (122111210113), we get a palindrome (433123321334).

The spelling of 311012111221 in words is "three hundred eleven billion, twelve million, one hundred eleven thousand, two hundred twenty-one".