221133430 has 32 divisors (see below), whose sum is σ = 455952384. Its totient is φ = 75642336.

The previous prime is 221133427. The next prime is 221133443. The reversal of 221133430 is 34331122.

It is a junction number, because it is equal to n+sod(n) for n = 221133398 and 221133407.

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, 28999 + ... + 35821.

It is an arithmetic number, because the mean of its divisors is an integer number (14248512).

Almost surely, 2^221133430 is an apocalyptic number.

221133430 is an abundant number, since it is smaller than the sum of its proper divisors (234818954).

221133430 is a wasteful number, since it uses less digits than its factorization.

221133430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 221133430 is about 14870.5558066940. Note that the first 3 decimals coincide. The cubic root of 221133430 is about 604.7160108767.

Adding to 221133430 its reverse (34331122), we get a palindrome (255464552).

The spelling of 221133430 in words is "two hundred twenty-one million, one hundred thirty-three thousand, four hundred thirty".