221422573 has 2 divisors, whose sum is σ = 221422574. Its totient is φ = 221422572.

The previous prime is 221422547. The next prime is 221422577. The reversal of 221422573 is 375224122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182709289 + 38713284 = 13517^2 + 6222^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422573 - 2²⁵ = 187868141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221422577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711286 + 110711287.

It is an arithmetic number, because the mean of its divisors is an integer number (110711287).

Almost surely, 2^221422573 is an apocalyptic number.

It is an amenable number.

221422573 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422573 is an equidigital number, since it uses as much as digits as its factorization.

221422573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 28.

The square root of 221422573 is about 14880.2746278421. The cubic root of 221422573 is about 604.9794615435.

Adding to 221422573 its reverse (375224122), we get a palindrome (596646695).

The spelling of 221422573 in words is "two hundred twenty-one million, four hundred twenty-two thousand, five hundred seventy-three".