221891899 has 6 divisors (see below), whose sum is σ = 234185460. Its totient is φ = 210213036.

The previous prime is 221891897. The next prime is 221891909. The reversal of 221891899 is 998198122.

It is not a de Polignac number, because 221891899 - 2¹ = 221891897 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 306969 + ... + 307690.

It is an arithmetic number, because the mean of its divisors is an integer number (39030910).

Almost surely, 2^221891899 is an apocalyptic number.

221891899 is a deficient number, since it is larger than the sum of its proper divisors (12293561).

221891899 is an equidigital number, since it uses as much as digits as its factorization.

221891899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614697 (or 614678 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

The square root of 221891899 is about 14896.0363519965. The cubic root of 221891899 is about 605.4065968856.

The spelling of 221891899 in words is "two hundred twenty-one million, eight hundred ninety-one thousand, eight hundred ninety-nine".