221500197 has 16 divisors (see below), whose sum is σ = 334342080. Its totient is φ = 144879696.

The previous prime is 221500187. The next prime is 221500199. The reversal of 221500197 is 791005122.

It is not a de Polignac number, because 221500197 - 2⁶ = 221500133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 221500197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221500199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75963 + ... + 78824.

It is an arithmetic number, because the mean of its divisors is an integer number (20896380).

Almost surely, 2^221500197 is an apocalyptic number.

221500197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

221500197 is a deficient number, since it is larger than the sum of its proper divisors (112841883).

221500197 is a wasteful number, since it uses less digits than its factorization.

221500197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154849 (or 154843 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 221500197 is about 14882.8826844802. The cubic root of 221500197 is about 605.0501490657.

The spelling of 221500197 in words is "two hundred twenty-one million, five hundred thousand, one hundred ninety-seven".