212221121 has 8 divisors (see below), whose sum is σ = 247699200. Its totient is φ = 178033248.

The previous prime is 212221067. The next prime is 212221153. The reversal of 212221121 is 121122212.

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 212221121 - 2¹⁰ = 212220097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212221096 and 212221105.

It is not an unprimeable number, because it can be changed into a prime (212221181) 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, 322196 + ... + 322853.

It is an arithmetic number, because the mean of its divisors is an integer number (30962400).

Almost surely, 2^212221121 is an apocalyptic number.

It is an amenable number.

212221121 is a deficient number, since it is larger than the sum of its proper divisors (35478079).

212221121 is an equidigital number, since it uses as much as digits as its factorization.

212221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645103.

The product of its digits is 32, while the sum is 14.

The square root of 212221121 is about 14567.8111259036. The cubic root of 212221121 is about 596.4804327421.

Adding to 212221121 its reverse (121122212), we get a palindrome (333343333).

The spelling of 212221121 in words is "two hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".