221998368 has 48 divisors (see below), whose sum is σ = 583644096. Its totient is φ = 73885440.

The previous prime is 221998367. The next prime is 221998373. The reversal of 221998368 is 863899122.

221998368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (221998367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80533 + ... + 83243.

It is an arithmetic number, because the mean of its divisors is an integer number (12159252).

Almost surely, 2^221998368 is an apocalyptic number.

It is an amenable number.

221998368 is an abundant number, since it is smaller than the sum of its proper divisors (361645728).

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

221998368 is a wasteful number, since it uses less digits than its factorization.

221998368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577 (or 3569 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 221998368 is about 14899.6096593166. The cubic root of 221998368 is about 605.5034108877.

The spelling of 221998368 in words is "two hundred twenty-one million, nine hundred ninety-eight thousand, three hundred sixty-eight".