221110212 has 24 divisors (see below), whose sum is σ = 528508512. Its totient is φ = 71905600.

The previous prime is 221110157. The next prime is 221110213. The reversal of 221110212 is 212011122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (221110213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224214 + ... + 225197.

It is an arithmetic number, because the mean of its divisors is an integer number (22021188).

Almost surely, 2^221110212 is an apocalyptic number.

It is an amenable number.

221110212 is an abundant number, since it is smaller than the sum of its proper divisors (307398300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221110212 is a wasteful number, since it uses less digits than its factorization.

221110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449459 (or 449457 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221110212 is about 14869.7751159861. The cubic root of 221110212 is about 604.6948459964.

Adding to 221110212 its reverse (212011122), we get a palindrome (433121334).

The spelling of 221110212 in words is "two hundred twenty-one million, one hundred ten thousand, two hundred twelve".