221022712 has 16 divisors (see below), whose sum is σ = 438795360. Its totient is φ = 104010624.

The previous prime is 221022707. The next prime is 221022713. The reversal of 221022712 is 217220122.

221022712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221022712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812448 + ... + 812719.

It is an arithmetic number, because the mean of its divisors is an integer number (27424710).

Almost surely, 2^221022712 is an apocalyptic number.

It is an amenable number.

221022712 is a deficient number, since it is larger than the sum of its proper divisors (217772648).

221022712 is a wasteful number, since it uses less digits than its factorization.

221022712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625190 (or 1625186 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 221022712 is about 14866.8326149184. The cubic root of 221022712 is about 604.6150701242.

Adding to 221022712 its reverse (217220122), we get a palindrome (438242834).

The spelling of 221022712 in words is "two hundred twenty-one million, twenty-two thousand, seven hundred twelve".