10311221 has 2 divisors, whose sum is σ = 10311222. Its totient is φ = 10311220.

The previous prime is 10311193. The next prime is 10311229. The reversal of 10311221 is 12211301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 3478225 = 2614^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 10311221 - 2¹⁸ = 10049077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10311229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155610 + 5155611.

It is an arithmetic number, because the mean of its divisors is an integer number (5155611).

Almost surely, 2^10311221 is an apocalyptic number.

It is an amenable number.

10311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10311221 is an equidigital number, since it uses as much as digits as its factorization.

10311221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 10311221 is about 3211.1089984614. The cubic root of 10311221 is about 217.6556933411.

Adding to 10311221 its reverse (12211301), we get a palindrome (22522522).

The spelling of 10311221 in words is "ten million, three hundred eleven thousand, two hundred twenty-one".