11310231221 has 2 divisors, whose sum is σ = 11310231222. Its totient is φ = 11310231220.

The previous prime is 11310231211. The next prime is 11310231227. The reversal of 11310231221 is 12213201311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11309259025 + 972196 = 106345^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 11310231221 - 2²⁶ = 11243122357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11310231221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11310231227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655115610 + 5655115611.

It is an arithmetic number, because the mean of its divisors is an integer number (5655115611).

Almost surely, 2^11310231221 is an apocalyptic number.

It is an amenable number.

11310231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11310231221 is an equidigital number, since it uses as much as digits as its factorization.

11310231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11310231221 its reverse (12213201311), we get a palindrome (23523432532).

The spelling of 11310231221 in words is "eleven billion, three hundred ten million, two hundred thirty-one thousand, two hundred twenty-one".