221898 has 16 divisors (see below), whose sum is σ = 458496. Its totient is φ = 71520.

The previous prime is 221891. The next prime is 221909. The reversal of 221898 is 898122.

221898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221898.

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 7 ways as a sum of consecutive naturals, for example, 411 + ... + 782.

It is an arithmetic number, because the mean of its divisors is an integer number (28656).

2²²¹⁸⁹⁸ is an apocalyptic number.

221898 is an abundant number, since it is smaller than the sum of its proper divisors (236598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221898 is a wasteful number, since it uses less digits than its factorization.

221898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229.

The product of its digits is 2304, while the sum is 30.

The square root of 221898 is about 471.0605056678. The cubic root of 221898 is about 60.5412145461.

The spelling of 221898 in words is "two hundred twenty-one thousand, eight hundred ninety-eight".