221313212 has 12 divisors (see below), whose sum is σ = 390726336. Its totient is φ = 109677120.

The previous prime is 221313193. The next prime is 221313227. The reversal of 221313212 is 212313122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244364 + ... + 245267.

It is an arithmetic number, because the mean of its divisors is an integer number (32560528).

Almost surely, 2^221313212 is an apocalyptic number.

It is an amenable number.

221313212 is a deficient number, since it is larger than the sum of its proper divisors (169413124).

221313212 is a wasteful number, since it uses less digits than its factorization.

221313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489748 (or 489746 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 221313212 is about 14876.5994770310. The cubic root of 221313212 is about 604.8798449998.

Adding to 221313212 its reverse (212313122), we get a palindrome (433626334).

The spelling of 221313212 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred twelve".