221899 has 4 divisors (see below), whose sum is σ = 225720. Its totient is φ = 218080.

The previous prime is 221891. The next prime is 221909. The reversal of 221899 is 998122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221899 - 2³ = 221891 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221899.

It is not an unprimeable number, because it can be changed into a prime (221891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822 + ... + 1939.

It is an arithmetic number, because the mean of its divisors is an integer number (56430).

2²²¹⁸⁹⁹ is an apocalyptic number.

221899 is a deficient number, since it is larger than the sum of its proper divisors (3821).

221899 is an equidigital number, since it uses as much as digits as its factorization.

221899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820.

The product of its digits is 2592, while the sum is 31.

The square root of 221899 is about 471.0615671014. The cubic root of 221899 is about 60.5413054905.

The spelling of 221899 in words is "two hundred twenty-one thousand, eight hundred ninety-nine".