212212321 has 4 divisors (see below), whose sum is σ = 215809200. Its totient is φ = 208615444.

The previous prime is 212212313. The next prime is 212212331. The reversal of 212212321 is 123212212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212212321 - 2³ = 212212313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212212295 and 212212304.

It is not an unprimeable number, because it can be changed into a prime (212212331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1798351 + ... + 1798468.

It is an arithmetic number, because the mean of its divisors is an integer number (53952300).

Almost surely, 2^212212321 is an apocalyptic number.

It is an amenable number.

212212321 is a deficient number, since it is larger than the sum of its proper divisors (3596879).

212212321 is an equidigital number, since it uses as much as digits as its factorization.

212212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596878.

The product of its digits is 96, while the sum is 16.

The square root of 212212321 is about 14567.5090870059. The cubic root of 212212321 is about 596.4721880391.

Adding to 212212321 its reverse (123212212), we get a palindrome (335424533).

The spelling of 212212321 in words is "two hundred twelve million, two hundred twelve thousand, three hundred twenty-one".