221800944 has 20 divisors (see below), whose sum is σ = 572985896. Its totient is φ = 73933632.

The previous prime is 221800933. The next prime is 221800963. The reversal of 221800944 is 449008122.

221800944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221800944² = 98391317518582272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2310379 + ... + 2310474.

Almost surely, 2^221800944 is an apocalyptic number.

221800944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221800944 is an abundant number, since it is smaller than the sum of its proper divisors (351184952).

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

221800944 is a wasteful number, since it uses less digits than its factorization.

221800944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620864 (or 4620858 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 221800944 is about 14892.9830457165. The cubic root of 221800944 is about 605.3238654853.

The spelling of 221800944 in words is "two hundred twenty-one million, eight hundred thousand, nine hundred forty-four".