221801012 has 12 divisors (see below), whose sum is σ = 389272800. Its totient is φ = 110580216.

The previous prime is 221800993. The next prime is 221801059. The reversal of 221801012 is 210108122.

It is a happy number.

221801012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 78512 + ... + 81287.

It is an arithmetic number, because the mean of its divisors is an integer number (32439400).

Almost surely, 2^221801012 is an apocalyptic number.

It is an amenable number.

221801012 is a deficient number, since it is larger than the sum of its proper divisors (167471788).

221801012 is a wasteful number, since it uses less digits than its factorization.

221801012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160150 (or 160148 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 221801012 is about 14892.9853286707. The cubic root of 221801012 is about 605.3239273456.

Adding to 221801012 its reverse (210108122), we get a palindrome (431909134).

The spelling of 221801012 in words is "two hundred twenty-one million, eight hundred one thousand, twelve".