221891898 has 32 divisors (see below), whose sum is σ = 452874240. Its totient is φ = 72462320.

The previous prime is 221891897. The next prime is 221891909. The reversal of 221891898 is 898198122.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221891897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69583 + ... + 72701.

It is an arithmetic number, because the mean of its divisors is an integer number (14152320).

Almost surely, 2^221891898 is an apocalyptic number.

221891898 is an abundant number, since it is smaller than the sum of its proper divisors (230982342).

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

221891898 is a wasteful number, since it uses less digits than its factorization.

221891898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362.

The product of its digits is 165888, while the sum is 48.

The square root of 221891898 is about 14896.0363184305. The cubic root of 221891898 is about 605.4065959761.

The spelling of 221891898 in words is "two hundred twenty-one million, eight hundred ninety-one thousand, eight hundred ninety-eight".