212233221 has 12 divisors (see below), whose sum is σ = 314844972. Its totient is φ = 137664576.

The previous prime is 212233193. The next prime is 212233237. The reversal of 212233221 is 122332212.

212233221 is a `hidden beast` number, since 212 + 233 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 200081025 + 12152196 = 14145^2 + 3486^2 .

It is not a de Polignac number, because 212233221 - 2⁶ = 212233157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212233194 and 212233203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212233621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318336 + ... + 319001.

It is an arithmetic number, because the mean of its divisors is an integer number (26237081).

Almost surely, 2^212233221 is an apocalyptic number.

It is an amenable number.

212233221 is a deficient number, since it is larger than the sum of its proper divisors (102611751).

212233221 is a wasteful number, since it uses less digits than its factorization.

212233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637380 (or 637377 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 212233221 is about 14568.2264191630. The cubic root of 212233221 is about 596.4917688367.

Adding to 212233221 its reverse (122332212), we get a palindrome (334565433).

It can be divided in two parts, 2 and 12233221, that multiplied together give a palindrome (24466442).

The spelling of 212233221 in words is "two hundred twelve million, two hundred thirty-three thousand, two hundred twenty-one".