221021116 has 12 divisors (see below), whose sum is σ = 389349520. Its totient is φ = 109778400.

The previous prime is 221021111. The next prime is 221021137. The reversal of 221021116 is 611120122.

221021116 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 221021116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021111) 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, 182361 + ... + 183568.

Almost surely, 2^221021116 is an apocalyptic number.

It is an amenable number.

221021116 is a deficient number, since it is larger than the sum of its proper divisors (168328404).

221021116 is a wasteful number, since it uses less digits than its factorization.

221021116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366084 (or 366082 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 221021116 is about 14866.7789382906. The cubic root of 221021116 is about 604.6136148168.

Adding to 221021116 its reverse (611120122), we get a palindrome (832141238).

The spelling of 221021116 in words is "two hundred twenty-one million, twenty-one thousand, one hundred sixteen".