212342221 has 16 divisors (see below), whose sum is σ = 266281344. Its totient is φ = 164833344.

The previous prime is 212342209. The next prime is 212342237. The reversal of 212342221 is 122243212.

It is not a de Polignac number, because 212342221 - 2⁷ = 212342093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212342201) 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 15 ways as a sum of consecutive naturals, for example, 17191 + ... + 26836.

It is an arithmetic number, because the mean of its divisors is an integer number (16642584).

Almost surely, 2^212342221 is an apocalyptic number.

It is an amenable number.

212342221 is a deficient number, since it is larger than the sum of its proper divisors (53939123).

212342221 is a wasteful number, since it uses less digits than its factorization.

212342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44100.

The product of its digits is 384, while the sum is 19.

The square root of 212342221 is about 14571.9669571407. The cubic root of 212342221 is about 596.5938679566.

Adding to 212342221 its reverse (122243212), we get a palindrome (334585433).

Subtracting from 212342221 its reverse (122243212), we obtain a palindrome (90099009).

It can be divided in two parts, 2123 and 42221, that added together give a palindrome (44344).

The spelling of 212342221 in words is "two hundred twelve million, three hundred forty-two thousand, two hundred twenty-one".