11722494221 has 2 divisors, whose sum is σ = 11722494222. Its totient is φ = 11722494220.

The previous prime is 11722494193. The next prime is 11722494241. The reversal of 11722494221 is 12249422711.

11722494221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9803178121 + 1919316100 = 99011^2 + 43810^2 .

It is a cyclic number.

It is not a de Polignac number, because 11722494221 - 2¹⁰ = 11722493197 is a prime.

It is a super-2 number, since 2×11722494221² (a number of 21 digits) contains 22 as substring.

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 (11722494241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5861247110 + 5861247111.

It is an arithmetic number, because the mean of its divisors is an integer number (5861247111).

Almost surely, 2^11722494221 is an apocalyptic number.

It is an amenable number.

11722494221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11722494221 is an equidigital number, since it uses as much as digits as its factorization.

11722494221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The spelling of 11722494221 in words is "eleven billion, seven hundred twenty-two million, four hundred ninety-four thousand, two hundred twenty-one".