2256336117221 has 2 divisors, whose sum is σ = 2256336117222. Its totient is φ = 2256336117220.

The previous prime is 2256336117193. The next prime is 2256336117227. The reversal of 2256336117221 is 1227116336522.

2256336117221 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., 1550759637025 + 705576480196 = 1245295^2 + 839986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256336117221 - 2³⁰ = 2255262375397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2256336117227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128168058610 + 1128168058611.

It is an arithmetic number, because the mean of its divisors is an integer number (1128168058611).

Almost surely, 2^{2256336117221} is an apocalyptic number.

It is an amenable number.

2256336117221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256336117221 is an equidigital number, since it uses as much as digits as its factorization.

2256336117221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The spelling of 2256336117221 in words is "two trillion, two hundred fifty-six billion, three hundred thirty-six million, one hundred seventeen thousand, two hundred twenty-one".