212241221 has 8 divisors (see below), whose sum is σ = 220543488. Its totient is φ = 204030000.

The previous prime is 212241199. The next prime is 212241251. The reversal of 212241221 is 122142212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212241221 - 2⁶ = 212241157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212241251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17990 + ... + 27351.

It is an arithmetic number, because the mean of its divisors is an integer number (27567936).

Almost surely, 2^212241221 is an apocalyptic number.

It is an amenable number.

212241221 is a deficient number, since it is larger than the sum of its proper divisors (8302267).

212241221 is a wasteful number, since it uses less digits than its factorization.

212241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45523.

The product of its digits is 128, while the sum is 17.

The square root of 212241221 is about 14568.5009867179. The cubic root of 212241221 is about 596.4992635386.

Adding to 212241221 its reverse (122142212), we get a palindrome (334383433).

Subtracting from 212241221 its reverse (122142212), we obtain a palindrome (90099009).

The spelling of 212241221 in words is "two hundred twelve million, two hundred forty-one thousand, two hundred twenty-one".