221232432257 has 2 divisors, whose sum is σ = 221232432258. Its totient is φ = 221232432256.

The previous prime is 221232432251. The next prime is 221232432271. The reversal of 221232432257 is 752234232122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219024936001 + 2207496256 = 468001^2 + 46984^2 .

It is a cyclic number.

It is not a de Polignac number, because 221232432257 - 2⁴ = 221232432241 is a prime.

It is a super-2 number, since 2×221232432257² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221232432251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110616216128 + 110616216129.

It is an arithmetic number, because the mean of its divisors is an integer number (110616216129).

Almost surely, 2^221232432257 is an apocalyptic number.

It is an amenable number.

221232432257 is a deficient number, since it is larger than the sum of its proper divisors (1).

221232432257 is an equidigital number, since it uses as much as digits as its factorization.

221232432257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 35.

Adding to 221232432257 its reverse (752234232122), we get a palindrome (973466664379).

The spelling of 221232432257 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirty-two thousand, two hundred fifty-seven".