221243244 has 12 divisors (see below), whose sum is σ = 516234264. Its totient is φ = 73747744.

The previous prime is 221243207. The next prime is 221243251. The reversal of 221243244 is 442342122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

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, 9218457 + ... + 9218480.

It is an arithmetic number, because the mean of its divisors is an integer number (43019522).

Almost surely, 2^221243244 is an apocalyptic number.

It is an amenable number.

221243244 is an abundant number, since it is smaller than the sum of its proper divisors (294991020).

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

221243244 is a wasteful number, since it uses less digits than its factorization.

221243244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18436944 (or 18436942 counting only the distinct ones).

The product of its digits is 3072, while the sum is 24.

The square root of 221243244 is about 14874.2476784542. The cubic root of 221243244 is about 604.8160941834.

Adding to 221243244 its reverse (442342122), we get a palindrome (663585366).

The spelling of 221243244 in words is "two hundred twenty-one million, two hundred forty-three thousand, two hundred forty-four".