311242221 has 12 divisors (see below), whose sum is σ = 450279648. Its totient is φ = 207168264.

The previous prime is 311242189. The next prime is 311242223. The reversal of 311242221 is 122242113.

It is a happy number.

It is not a de Polignac number, because 311242221 - 2⁵ = 311242189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311242194 and 311242203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311242223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21105 + ... + 32678.

It is an arithmetic number, because the mean of its divisors is an integer number (37523304).

Almost surely, 2^311242221 is an apocalyptic number.

It is an amenable number.

311242221 is a deficient number, since it is larger than the sum of its proper divisors (139037427).

311242221 is a wasteful number, since it uses less digits than its factorization.

311242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54432 (or 54429 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 311242221 is about 17642.0582982825. The cubic root of 311242221 is about 677.6927432800.

Adding to 311242221 its reverse (122242113), we get a palindrome (433484334).

The spelling of 311242221 in words is "three hundred eleven million, two hundred forty-two thousand, two hundred twenty-one".