221423012 has 12 divisors (see below), whose sum is σ = 390449136. Its totient is φ = 109866120.

The previous prime is 221423009. The next prime is 221423023. The reversal of 221423012 is 210324122.

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, 210758 + ... + 211805.

It is an arithmetic number, because the mean of its divisors is an integer number (32537428).

Almost surely, 2^221423012 is an apocalyptic number.

It is an amenable number.

221423012 is a deficient number, since it is larger than the sum of its proper divisors (169026124).

221423012 is a wasteful number, since it uses less digits than its factorization.

221423012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422698 (or 422696 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221423012 is about 14880.2893789066. The cubic root of 221423012 is about 604.9798613609.

Adding to 221423012 its reverse (210324122), we get a palindrome (431747134).

The spelling of 221423012 in words is "two hundred twenty-one million, four hundred twenty-three thousand, twelve".