11311210323221 has 2 divisors, whose sum is σ = 11311210323222. Its totient is φ = 11311210323220.

The previous prime is 11311210323173. The next prime is 11311210323239. The reversal of 11311210323221 is 12232301211311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7377275260996 + 3933935062225 = 2716114^2 + 1983415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311210323221 - 2³⁰ = 11310136581397 is a prime.

It is a super-2 number, since 2×11311210323221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11311210323241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655605161610 + 5655605161611.

It is an arithmetic number, because the mean of its divisors is an integer number (5655605161611).

Almost surely, 2^{11311210323221} is an apocalyptic number.

It is an amenable number.

11311210323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311210323221 is an equidigital number, since it uses as much as digits as its factorization.

11311210323221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 11311210323221 its reverse (12232301211311), we get a palindrome (23543511534532).

The spelling of 11311210323221 in words is "eleven trillion, three hundred eleven billion, two hundred ten million, three hundred twenty-three thousand, two hundred twenty-one".