221425430 has 16 divisors (see below), whose sum is σ = 419543280. Its totient is φ = 83908512.

The previous prime is 221425403. The next prime is 221425433. The reversal of 221425430 is 34524122.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221425396 and 221425405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221425433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582509 + ... + 582888.

It is an arithmetic number, because the mean of its divisors is an integer number (26221455).

Almost surely, 2^221425430 is an apocalyptic number.

221425430 is a deficient number, since it is larger than the sum of its proper divisors (198117850).

221425430 is a wasteful number, since it uses less digits than its factorization.

221425430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165423.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 221425430 is about 14880.3706271047. The cubic root of 221425430 is about 604.9820635349.

Adding to 221425430 its reverse (34524122), we get a palindrome (255949552).

It can be divided in two parts, 22142 and 5430, that added together give a palindrome (27572).

The spelling of 221425430 in words is "two hundred twenty-one million, four hundred twenty-five thousand, four hundred thirty".