3111201221 has 2 divisors, whose sum is σ = 3111201222. Its totient is φ = 3111201220.

The previous prime is 3111201209. The next prime is 3111201257. The reversal of 3111201221 is 1221021113.

3111201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1839208996 + 1271992225 = 42886^2 + 35665^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111201221 - 2²⁶ = 3044092357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3111201196 and 3111201205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3111201271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1555600610 + 1555600611.

It is an arithmetic number, because the mean of its divisors is an integer number (1555600611).

Almost surely, 2^3111201221 is an apocalyptic number.

It is an amenable number.

3111201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111201221 is an equidigital number, since it uses as much as digits as its factorization.

3111201221 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 14.

The square root of 3111201221 is about 55778.1428608017. The cubic root of 3111201221 is about 1459.8538073736.

Adding to 3111201221 its reverse (1221021113), we get a palindrome (4332222334).

The spelling of 3111201221 in words is "three billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".