221450601457 has 2 divisors, whose sum is σ = 221450601458. Its totient is φ = 221450601456.

The previous prime is 221450601443. The next prime is 221450601497. The reversal of 221450601457 is 754106054122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113525868096 + 107924733361 = 336936^2 + 328519^2 .

It is a cyclic number.

It is not a de Polignac number, because 221450601457 - 2⁷ = 221450601329 is a prime.

It is not a weakly prime, because it can be changed into another prime (221450601497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110725300728 + 110725300729.

It is an arithmetic number, because the mean of its divisors is an integer number (110725300729).

Almost surely, 2^221450601457 is an apocalyptic number.

It is an amenable number.

221450601457 is a deficient number, since it is larger than the sum of its proper divisors (1).

221450601457 is an equidigital number, since it uses as much as digits as its factorization.

221450601457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 37.

Adding to 221450601457 its reverse (754106054122), we get a palindrome (975556655579).

The spelling of 221450601457 in words is "two hundred twenty-one billion, four hundred fifty million, six hundred one thousand, four hundred fifty-seven".