221432424 has 16 divisors (see below), whose sum is σ = 553581120. Its totient is φ = 73810800.

The previous prime is 221432417. The next prime is 221432437. The reversal of 221432424 is 424234122.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 9226351 = 221432424 / (2 + 2 + 1 + 4 + 3 + 2 + 4 + 2 + 4).

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

It is a junction number, because it is equal to n+sod(n) for n = 221432394 and 221432403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4613152 + ... + 4613199.

It is an arithmetic number, because the mean of its divisors is an integer number (34598820).

Almost surely, 2^221432424 is an apocalyptic number.

221432424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221432424 is an abundant number, since it is smaller than the sum of its proper divisors (332148696).

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

221432424 is a wasteful number, since it uses less digits than its factorization.

221432424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9226360 (or 9226356 counting only the distinct ones).

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

The square root of 221432424 is about 14880.6056328363. The cubic root of 221432424 is about 604.9884331737.

Adding to 221432424 its reverse (424234122), we get a palindrome (645666546).

The spelling of 221432424 in words is "two hundred twenty-one million, four hundred thirty-two thousand, four hundred twenty-four".