221204530 has 16 divisors (see below), whose sum is σ = 411012864. Its totient is φ = 85627440.

The previous prime is 221204507. The next prime is 221204531. The reversal of 221204530 is 35402122.

It is a junction number, because it is equal to n+sod(n) for n = 221204498 and 221204507.

It is not an unprimeable number, because it can be changed into a prime (221204531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 356472 + ... + 357091.

It is an arithmetic number, because the mean of its divisors is an integer number (25688304).

Almost surely, 2^221204530 is an apocalyptic number.

221204530 is a deficient number, since it is larger than the sum of its proper divisors (189808334).

221204530 is a wasteful number, since it uses less digits than its factorization.

221204530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713601.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221204530 is about 14872.9462447761. The cubic root of 221204530 is about 604.7808144378.

Adding to 221204530 its reverse (35402122), we get a palindrome (256606652).

The spelling of 221204530 in words is "two hundred twenty-one million, two hundred four thousand, five hundred thirty".