221201804 has 24 divisors (see below), whose sum is σ = 397024320. Its totient is φ = 107778384.

The previous prime is 221201803. The next prime is 221201837. The reversal of 221201804 is 408102122.

It is a happy number.

221201804 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221201803) 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, 88727 + ... + 91185.

It is an arithmetic number, because the mean of its divisors is an integer number (16542680).

Almost surely, 2^221201804 is an apocalyptic number.

It is an amenable number.

221201804 is a deficient number, since it is larger than the sum of its proper divisors (175822516).

221201804 is a wasteful number, since it uses less digits than its factorization.

221201804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029 (or 3027 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 221201804 is about 14872.8546015888. The cubic root of 221201804 is about 604.7783301015.

Adding to 221201804 its reverse (408102122), we get a palindrome (629303926).

The spelling of 221201804 in words is "two hundred twenty-one million, two hundred one thousand, eight hundred four".