221200169 has 2 divisors, whose sum is σ = 221200170. Its totient is φ = 221200168.

The previous prime is 221200151. The next prime is 221200183. The reversal of 221200169 is 961002122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 5697769 = 14680^2 + 2387^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200169 - 2¹⁶ = 221134633 is a prime.

It is a super-2 number, since 2×221200169² = 97859029531257122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221200069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600084 + 110600085.

It is an arithmetic number, because the mean of its divisors is an integer number (110600085).

Almost surely, 2^221200169 is an apocalyptic number.

It is an amenable number.

221200169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200169 is an equidigital number, since it uses as much as digits as its factorization.

221200169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 221200169 is about 14872.7996355763. The cubic root of 221200169 is about 604.7768400368.

The spelling of 221200169 in words is "two hundred twenty-one million, two hundred thousand, one hundred sixty-nine".