221598 has 24 divisors (see below), whose sum is σ = 517608. Its totient is φ = 68112.

The previous prime is 221587. The next prime is 221603. The reversal of 221598 is 895122.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221598.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240 + ... + 707.

It is an arithmetic number, because the mean of its divisors is an integer number (21567).

2²²¹⁵⁹⁸ is an apocalyptic number.

221598 is an abundant number, since it is smaller than the sum of its proper divisors (296010).

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

221598 is a wasteful number, since it uses less digits than its factorization.

221598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 965 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 221598 is about 470.7419675364. The cubic root of 221598 is about 60.5139188884.

The spelling of 221598 in words is "two hundred twenty-one thousand, five hundred ninety-eight".