221430336 has 56 divisors (see below), whose sum is σ = 590153760. Its totient is φ = 73270272.

The previous prime is 221430329. The next prime is 221430353. The reversal of 221430336 is 633034122.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 22540 + ... + 30836.

It is an arithmetic number, because the mean of its divisors is an integer number (10538460).

Almost surely, 2^221430336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221430336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295076880).

221430336 is an abundant number, since it is smaller than the sum of its proper divisors (368723424).

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

221430336 is a wasteful number, since it uses less digits than its factorization.

221430336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451 (or 8441 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 221430336 is about 14880.5354742361. The cubic root of 221430336 is about 604.9865315855.

Adding to 221430336 its reverse (633034122), we get a palindrome (854464458).

The spelling of 221430336 in words is "two hundred twenty-one million, four hundred thirty thousand, three hundred thirty-six".