221225430 has 32 divisors (see below), whose sum is σ = 532919808. Its totient is φ = 58773600.

The previous prime is 221225429. The next prime is 221225441. The reversal of 221225430 is 34522122.

It is a junction number, because it is equal to n+sod(n) for n = 221225397 and 221225406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5476 + ... + 21735.

It is an arithmetic number, because the mean of its divisors is an integer number (16653744).

Almost surely, 2^221225430 is an apocalyptic number.

221225430 is an abundant number, since it is smaller than the sum of its proper divisors (311694378).

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

221225430 is a wasteful number, since it uses less digits than its factorization.

221225430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27492.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221225430 is about 14873.6488461978. The cubic root of 221225430 is about 604.7998609449.

Adding to 221225430 its reverse (34522122), we get a palindrome (255747552).

The spelling of 221225430 in words is "two hundred twenty-one million, two hundred twenty-five thousand, four hundred thirty".