212231121 has 16 divisors (see below), whose sum is σ = 298213440. Its totient is φ = 133885440.

The previous prime is 212231119. The next prime is 212231137. The reversal of 212231121 is 121132212.

212231121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212231121 - 2¹ = 212231119 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212231121.

It is not an unprimeable number, because it can be changed into a prime (212231161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66441 + ... + 69561.

It is an arithmetic number, because the mean of its divisors is an integer number (18638340).

Almost surely, 2^212231121 is an apocalyptic number.

It is an amenable number.

212231121 is a deficient number, since it is larger than the sum of its proper divisors (85982319).

212231121 is a wasteful number, since it uses less digits than its factorization.

212231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336.

The product of its digits is 48, while the sum is 15.

The square root of 212231121 is about 14568.1543443224. The cubic root of 212231121 is about 596.4898014462.

Adding to 212231121 its reverse (121132212), we get a palindrome (333363333).

The spelling of 212231121 in words is "two hundred twelve million, two hundred thirty-one thousand, one hundred twenty-one".