221000197 has 4 divisors (see below), whose sum is σ = 241091136. Its totient is φ = 200909260.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000197 is 791000122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221000197 - 2⁷ = 221000069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10045453 + ... + 10045474.

It is an arithmetic number, because the mean of its divisors is an integer number (60272784).

Almost surely, 2^221000197 is an apocalyptic number.

It is an amenable number.

221000197 is a deficient number, since it is larger than the sum of its proper divisors (20090939).

221000197 is a wasteful number, since it uses less digits than its factorization.

221000197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090938.

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

The square root of 221000197 is about 14866.0753731440. The cubic root of 221000197 is about 604.5945392469.

The spelling of 221000197 in words is "two hundred twenty-one million, one hundred ninety-seven", and thus it is an aban number.