221204434 has 8 divisors (see below), whose sum is σ = 361970928. Its totient is φ = 100547460.

The previous prime is 221204429. The next prime is 221204497. The reversal of 221204434 is 434402122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 10054747 = 221204434 / (2 + 2 + 1 + 2 + 0 + 4 + 4 + 3 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5027352 + ... + 5027395.

It is an arithmetic number, because the mean of its divisors is an integer number (45246366).

Almost surely, 2^221204434 is an apocalyptic number.

221204434 is a deficient number, since it is larger than the sum of its proper divisors (140766494).

221204434 is a wasteful number, since it uses less digits than its factorization.

221204434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10054760.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 221204434 is about 14872.9430174394. The cubic root of 221204434 is about 604.7807269486.

Adding to 221204434 its reverse (434402122), we get a palindrome (655606556).

The spelling of 221204434 in words is "two hundred twenty-one million, two hundred four thousand, four hundred thirty-four".