221362263257 has 2 divisors, whose sum is σ = 221362263258. Its totient is φ = 221362263256.

The previous prime is 221362263179. The next prime is 221362263299. The reversal of 221362263257 is 752362263122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133616567296 + 87745695961 = 365536^2 + 296219^2 .

It is a cyclic number.

It is not a de Polignac number, because 221362263257 - 2²⁴ = 221345486041 is a prime.

It is a super-2 number, since 2×221362263257² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221362263457) 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, 110681131628 + 110681131629.

It is an arithmetic number, because the mean of its divisors is an integer number (110681131629).

Almost surely, 2^221362263257 is an apocalyptic number.

It is an amenable number.

221362263257 is a deficient number, since it is larger than the sum of its proper divisors (1).

221362263257 is an equidigital number, since it uses as much as digits as its factorization.

221362263257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 41.

The spelling of 221362263257 in words is "two hundred twenty-one billion, three hundred sixty-two million, two hundred sixty-three thousand, two hundred fifty-seven".