221598912 has 84 divisors (see below), whose sum is σ = 606341688. Its totient is φ = 71424000.

The previous prime is 221598911. The next prime is 221598929. The reversal of 221598912 is 219895122.

221598912 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221598911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183912 + ... + 185112.

Almost surely, 2^221598912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221598912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303170844).

221598912 is an abundant number, since it is smaller than the sum of its proper divisors (384742776).

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

221598912 is a wasteful number, since it uses less digits than its factorization.

221598912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278 (or 1237 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 221598912 is about 14886.1987088712. The cubic root of 221598912 is about 605.1400190457.

The spelling of 221598912 in words is "two hundred twenty-one million, five hundred ninety-eight thousand, nine hundred twelve".