221424612 has 24 divisors (see below), whose sum is σ = 517267296. Its totient is φ = 73721088.

The previous prime is 221424607. The next prime is 221424649. The reversal of 221424612 is 216424122.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 148 + ... + 21044.

It is an arithmetic number, because the mean of its divisors is an integer number (21552804).

Almost surely, 2^221424612 is an apocalyptic number.

It is an amenable number.

221424612 is an abundant number, since it is smaller than the sum of its proper divisors (295842684).

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

221424612 is a wasteful number, since it uses less digits than its factorization.

221424612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21787 (or 21785 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 221424612 is about 14880.3431412048. The cubic root of 221424612 is about 604.9813185498.

Adding to 221424612 its reverse (216424122), we get a palindrome (437848734).

The spelling of 221424612 in words is "two hundred twenty-one million, four hundred twenty-four thousand, six hundred twelve".