221243197 has 8 divisors (see below), whose sum is σ = 253858752. Its totient is φ = 188880000.

The previous prime is 221243177. The next prime is 221243207. The reversal of 221243197 is 791342122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221243197 - 2⁷ = 221243069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221243107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61204 + ... + 64717.

It is an arithmetic number, because the mean of its divisors is an integer number (31732344).

Almost surely, 2^221243197 is an apocalyptic number.

It is an amenable number.

221243197 is a deficient number, since it is larger than the sum of its proper divisors (32615555).

221243197 is a wasteful number, since it uses less digits than its factorization.

221243197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126179.

The product of its digits is 6048, while the sum is 31.

The square root of 221243197 is about 14874.2460985423. The cubic root of 221243197 is about 604.8160513552.

The spelling of 221243197 in words is "two hundred twenty-one million, two hundred forty-three thousand, one hundred ninety-seven".