221424523 has 2 divisors, whose sum is σ = 221424524. Its totient is φ = 221424522.

The previous prime is 221424503. The next prime is 221424527. The reversal of 221424523 is 325424122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221424523 - 2⁵ = 221424491 is a prime.

It is not a weakly prime, because it can be changed into another prime (221424527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110712261 + 110712262.

It is an arithmetic number, because the mean of its divisors is an integer number (110712262).

Almost surely, 2^221424523 is an apocalyptic number.

221424523 is a deficient number, since it is larger than the sum of its proper divisors (1).

221424523 is an equidigital number, since it uses as much as digits as its factorization.

221424523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 25.

The square root of 221424523 is about 14880.3401506820. The cubic root of 221424523 is about 604.9812374939.

Adding to 221424523 its reverse (325424122), we get a palindrome (546848645).

The spelling of 221424523 in words is "two hundred twenty-one million, four hundred twenty-four thousand, five hundred twenty-three".