212334221 has 16 divisors (see below), whose sum is σ = 241041408. Its totient is φ = 185295600.

The previous prime is 212334217. The next prime is 212334277. The reversal of 212334221 is 122433212.

It is a cyclic number.

It is not a de Polignac number, because 212334221 - 2² = 212334217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212334193 and 212334202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212334281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40856 + ... + 45758.

It is an arithmetic number, because the mean of its divisors is an integer number (15065088).

Almost surely, 2^212334221 is an apocalyptic number.

It is an amenable number.

212334221 is a deficient number, since it is larger than the sum of its proper divisors (28707187).

212334221 is a wasteful number, since it uses less digits than its factorization.

212334221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5072.

The product of its digits is 576, while the sum is 20.

The square root of 212334221 is about 14571.6924548935. The cubic root of 212334221 is about 596.5863756315.

Adding to 212334221 its reverse (122433212), we get a palindrome (334767433).

It can be divided in two parts, 212 and 334221, that added together give a palindrome (334433).

The spelling of 212334221 in words is "two hundred twelve million, three hundred thirty-four thousand, two hundred twenty-one".