221203212 has 48 divisors (see below), whose sum is σ = 524439552. Its totient is φ = 72558720.

The previous prime is 221203193. The next prime is 221203219. The reversal of 221203212 is 212302122.

It is a happy number.

221203212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221203191 and 221203200.

It is not an unprimeable number, because it can be changed into a prime (221203219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235608 + ... + 236544.

It is an arithmetic number, because the mean of its divisors is an integer number (10925824).

Almost surely, 2^221203212 is an apocalyptic number.

It is an amenable number.

221203212 is an abundant number, since it is smaller than the sum of its proper divisors (303236340).

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

221203212 is a wasteful number, since it uses less digits than its factorization.

221203212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221203212 is about 14872.9019360715. The cubic root of 221203212 is about 604.7796132829.

Adding to 221203212 its reverse (212302122), we get a palindrome (433505334).

The spelling of 221203212 in words is "two hundred twenty-one million, two hundred three thousand, two hundred twelve".