221211233312 has 12 divisors (see below), whose sum is σ = 435509615646. Its totient is φ = 110605616640.

The previous prime is 221211233293. The next prime is 221211233317. The reversal of 221211233312 is 213332112122.

It can be written as a sum of positive squares in only one way, i.e., 196749022096 + 24462211216 = 443564^2 + 156404^2 .

It is not an unprimeable number, because it can be changed into a prime (221211233317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3456425489 + ... + 3456425552.

Almost surely, 2^221211233312 is an apocalyptic number.

It is an amenable number.

221211233312 is a deficient number, since it is larger than the sum of its proper divisors (214298382334).

221211233312 is an equidigital number, since it uses as much as digits as its factorization.

221211233312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6912851051 (or 6912851043 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 221211233312 its reverse (213332112122), we get a palindrome (434543345434).

The spelling of 221211233312 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred thirty-three thousand, three hundred twelve".