221085169 has 2 divisors, whose sum is σ = 221085170. Its totient is φ = 221085168.

The previous prime is 221085113. The next prime is 221085173. The reversal of 221085169 is 961580122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220908769 + 176400 = 14863^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 221085169 - 2¹⁵ = 221052401 is a prime.

It is a super-2 number, since 2×221085169² = 97757303903517122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221083169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110542584 + 110542585.

It is an arithmetic number, because the mean of its divisors is an integer number (110542585).

Almost surely, 2^221085169 is an apocalyptic number.

It is an amenable number.

221085169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221085169 is an equidigital number, since it uses as much as digits as its factorization.

221085169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 221085169 is about 14868.9330148468. The cubic root of 221085169 is about 604.6720158361.

The spelling of 221085169 in words is "two hundred twenty-one million, eighty-five thousand, one hundred sixty-nine".