311120221 has 2 divisors, whose sum is σ = 311120222. Its totient is φ = 311120220.

The previous prime is 311120203. The next prime is 311120239. The reversal of 311120221 is 122021113.

It is a balanced prime because it is at equal distance from previous prime (311120203) and next prime (311120239).

It can be written as a sum of positive squares in only one way, i.e., 271920100 + 39200121 = 16490^2 + 6261^2 .

It is a cyclic number.

It is not a de Polignac number, because 311120221 - 2¹⁷ = 310989149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311120521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560110 + 155560111.

It is an arithmetic number, because the mean of its divisors is an integer number (155560111).

Almost surely, 2^311120221 is an apocalyptic number.

It is an amenable number.

311120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311120221 is an equidigital number, since it uses as much as digits as its factorization.

311120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 311120221 is about 17638.6003129500. The cubic root of 311120221 is about 677.6041849010.

Adding to 311120221 its reverse (122021113), we get a palindrome (433141334).

It can be divided in two parts, 3111 and 20221, that added together give a palindrome (23332).

The spelling of 311120221 in words is "three hundred eleven million, one hundred twenty thousand, two hundred twenty-one".