221069 has 2 divisors, whose sum is σ = 221070. Its totient is φ = 221068.

The previous prime is 221059. The next prime is 221071. The reversal of 221069 is 960122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 169 = 470^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 221069 - 2¹² = 216973 is a prime.

It is a super-2 number, since 2×221069² = 97743005522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 221071, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 221069.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221069.

It is not a weakly prime, because it can be changed into another prime (221059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110534 + 110535.

It is an arithmetic number, because the mean of its divisors is an integer number (110535).

2²²¹⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

221069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221069 is an equidigital number, since it uses as much as digits as its factorization.

221069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 221069 is about 470.1797528605. The cubic root of 221069 is about 60.4657274639.

The spelling of 221069 in words is "two hundred twenty-one thousand, sixty-nine".