221120197 has 2 divisors, whose sum is σ = 221120198. Its totient is φ = 221120196.

The previous prime is 221120161. The next prime is 221120219. The reversal of 221120197 is 791021122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200335716 + 20784481 = 14154^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120197 - 2²⁷ = 86902469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221120897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560098 + 110560099.

It is an arithmetic number, because the mean of its divisors is an integer number (110560099).

Almost surely, 2^221120197 is an apocalyptic number.

It is an amenable number.

221120197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120197 is an equidigital number, since it uses as much as digits as its factorization.

221120197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 221120197 is about 14870.1108603803. The cubic root of 221120197 is about 604.7039482251.

The spelling of 221120197 in words is "two hundred twenty-one million, one hundred twenty thousand, one hundred ninety-seven".