221463844 has 12 divisors (see below), whose sum is σ = 442927744. Its totient is φ = 94913064.

The previous prime is 221463797. The next prime is 221463871. The reversal of 221463844 is 448364122.

221463844 is an admirable 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, 3954684 + ... + 3954739.

Almost surely, 2^221463844 is an apocalyptic number.

It is an amenable number.

221463844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221463844 is a wasteful number, since it uses less digits than its factorization.

221463844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909434 (or 7909432 counting only the distinct ones).

The product of its digits is 36864, while the sum is 34.

The square root of 221463844 is about 14881.6613319884. The cubic root of 221463844 is about 605.0170466248.

The spelling of 221463844 in words is "two hundred twenty-one million, four hundred sixty-three thousand, eight hundred forty-four".