221309199 has 16 divisors (see below), whose sum is σ = 331052800. Its totient is φ = 146105208.

The previous prime is 221309191. The next prime is 221309203. The reversal of 221309199 is 991903122.

It is a happy number.

221309199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221309199 - 2³ = 221309191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221309191) 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, 37009 + ... + 42570.

It is an arithmetic number, because the mean of its divisors is an integer number (20690800).

Almost surely, 2^221309199 is an apocalyptic number.

221309199 is a deficient number, since it is larger than the sum of its proper divisors (109743601).

221309199 is a wasteful number, since it uses less digits than its factorization.

221309199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79691 (or 79685 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 221309199 is about 14876.4646001663. The cubic root of 221309199 is about 604.8761889483.

It can be divided in two parts, 22130 and 9199, that added together give a square (31329 = 177²).

The spelling of 221309199 in words is "two hundred twenty-one million, three hundred nine thousand, one hundred ninety-nine".