212211121 has 6 divisors (see below), whose sum is σ = 217514966. Its totient is φ = 207033600.

The previous prime is 212211113. The next prime is 212211127. The reversal of 212211121 is 121112212.

It can be written as a sum of positive squares in 3 ways, for example, as 39551521 + 172659600 = 6289^2 + 13140^2 .

It is not a de Polignac number, because 212211121 - 2³ = 212211113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212211127) 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 5 ways as a sum of consecutive naturals, for example, 61440 + ... + 64801.

Almost surely, 2^212211121 is an apocalyptic number.

It is an amenable number.

212211121 is a deficient number, since it is larger than the sum of its proper divisors (5303845).

212211121 is an equidigital number, since it uses as much as digits as its factorization.

212211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126323 (or 126282 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 212211121 is about 14567.4678993983. The cubic root of 212211121 is about 596.4710637437.

Adding to 212211121 its reverse (121112212), we get a palindrome (333323333).

The spelling of 212211121 in words is "two hundred twelve million, two hundred eleven thousand, one hundred twenty-one".