221567 has 2 divisors, whose sum is σ = 221568. Its totient is φ = 221566.

The previous prime is 221549. The next prime is 221581. The reversal of 221567 is 765122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221567 - 2⁸ = 221311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110783 + 110784.

It is an arithmetic number, because the mean of its divisors is an integer number (110784).

2²²¹⁵⁶⁷ is an apocalyptic number.

221567 is a deficient number, since it is larger than the sum of its proper divisors (1).

221567 is an equidigital number, since it uses as much as digits as its factorization.

221567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 221567 is about 470.7090396413. The cubic root of 221567 is about 60.5110969331.

Adding to 221567 its reverse (765122), we get a palindrome (986689).

It can be divided in two parts, 2 and 21567, that multiplied together give a palindrome (43134).

The spelling of 221567 in words is "two hundred twenty-one thousand, five hundred sixty-seven".