221246244 has 18 divisors (see below), whose sum is σ = 559261430. Its totient is φ = 73748736.

The previous prime is 221246243. The next prime is 221246281. The reversal of 221246244 is 442642122.

221246244 is a `hidden beast` number, since 22 + 12 + 4 + 624 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 119639844 + 101606400 = 10938^2 + 10080^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (221246243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3072829 + ... + 3072900.

Almost surely, 2^221246244 is an apocalyptic number.

It is an amenable number.

221246244 is an abundant number, since it is smaller than the sum of its proper divisors (338015186).

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

221246244 is a wasteful number, since it uses less digits than its factorization.

221246244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145739 (or 6145734 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 221246244 is about 14874.3485235489. The cubic root of 221246244 is about 604.8188278866.

Adding to 221246244 its reverse (442642122), we get a palindrome (663888366).

The spelling of 221246244 in words is "two hundred twenty-one million, two hundred forty-six thousand, two hundred forty-four".