11722789556221 has 2 divisors, whose sum is σ = 11722789556222. Its totient is φ = 11722789556220.

The previous prime is 11722789556197. The next prime is 11722789556239. The reversal of 11722789556221 is 12265598722711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11286844968100 + 435944588121 = 3359590^2 + 660261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11722789556221 - 2¹¹ = 11722789554173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11722789556321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5861394778110 + 5861394778111.

It is an arithmetic number, because the mean of its divisors is an integer number (5861394778111).

Almost surely, 2^{11722789556221} is an apocalyptic number.

It is an amenable number.

11722789556221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11722789556221 is an equidigital number, since it uses as much as digits as its factorization.

11722789556221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 58.

The spelling of 11722789556221 in words is "eleven trillion, seven hundred twenty-two billion, seven hundred eighty-nine million, five hundred fifty-six thousand, two hundred twenty-one".