221996598 has 16 divisors (see below), whose sum is σ = 463297536. Its totient is φ = 70781480.

The previous prime is 221996569. The next prime is 221996609. The reversal of 221996598 is 895699122.

It is a self number, because there is not a number n which added to its sum of digits gives 221996598.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804198 + ... + 804473.

It is an arithmetic number, because the mean of its divisors is an integer number (28956096).

Almost surely, 2^221996598 is an apocalyptic number.

221996598 is an abundant number, since it is smaller than the sum of its proper divisors (241300938).

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

221996598 is a wasteful number, since it uses less digits than its factorization.

221996598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608699.

The product of its digits is 699840, while the sum is 51.

The square root of 221996598 is about 14899.5502616690. The cubic root of 221996598 is about 605.5018016508.

The spelling of 221996598 in words is "two hundred twenty-one million, nine hundred ninety-six thousand, five hundred ninety-eight".