221000244 has 12 divisors (see below), whose sum is σ = 515667264. Its totient is φ = 73666744.

The previous prime is 221000243. The next prime is 221000249. The reversal of 221000244 is 442000122.

221000244 is digitally balanced in base 3, 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 (12).

It is a super-2 number, since 2×221000244² = 97682215696119072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9208332 + ... + 9208355.

It is an arithmetic number, because the mean of its divisors is an integer number (42972272).

Almost surely, 2^221000244 is an apocalyptic number.

It is an amenable number.

221000244 is an abundant number, since it is smaller than the sum of its proper divisors (294667020).

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

221000244 is a wasteful number, since it uses less digits than its factorization.

221000244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18416694 (or 18416692 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 221000244 is about 14866.0769539243. The cubic root of 221000244 is about 604.5945821065.

Adding to 221000244 its reverse (442000122), we get a palindrome (663000366).

The spelling of 221000244 in words is "two hundred twenty-one million, two hundred forty-four", and thus it is an aban number.