221197 has 2 divisors, whose sum is σ = 221198. Its totient is φ = 221196.

The previous prime is 221173. The next prime is 221201. The reversal of 221197 is 791122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 106276 = 339^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 221197 - 2⁷ = 221069 is a prime.

It is a super-2 number, since 2×221197² = 97856225618, which contains 22 as substring.

221197 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110598 + 110599.

It is an arithmetic number, because the mean of its divisors is an integer number (110599).

2²²¹¹⁹⁷ is an apocalyptic number.

It is an amenable number.

221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221197 is an equidigital number, since it uses as much as digits as its factorization.

221197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 22.

The square root of 221197 is about 470.3158513170. The cubic root of 221197 is about 60.4773951933.

The spelling of 221197 in words is "two hundred twenty-one thousand, one hundred ninety-seven".