221213332 has 6 divisors (see below), whose sum is σ = 387123338. Its totient is φ = 110606664.

The previous prime is 221213329. The next prime is 221213353. The reversal of 221213332 is 233312122.

221213332 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 174345616 + 46867716 = 13204^2 + 6846^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27651663 + ... + 27651670.

Almost surely, 2^221213332 is an apocalyptic number.

It is an amenable number.

221213332 is a deficient number, since it is larger than the sum of its proper divisors (165910006).

221213332 is a wasteful number, since it uses less digits than its factorization.

221213332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55303337 (or 55303335 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 221213332 is about 14873.2421482339. The cubic root of 221213332 is about 604.7888359886.

Adding to 221213332 its reverse (233312122), we get a palindrome (454525454).

The spelling of 221213332 in words is "two hundred twenty-one million, two hundred thirteen thousand, three hundred thirty-two".