212023321 has 4 divisors (see below), whose sum is σ = 219334500. Its totient is φ = 204712144.

The previous prime is 212023313. The next prime is 212023327. The reversal of 212023321 is 123320212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67158025 + 144865296 = 8195^2 + 12036^2 .

It is a cyclic number.

It is not a de Polignac number, because 212023321 - 2³ = 212023313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212023295 and 212023304.

It is not an unprimeable number, because it can be changed into a prime (212023327) 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, 3655546 + ... + 3655603.

It is an arithmetic number, because the mean of its divisors is an integer number (54833625).

Almost surely, 2^212023321 is an apocalyptic number.

It is an amenable number.

212023321 is a deficient number, since it is larger than the sum of its proper divisors (7311179).

212023321 is an equidigital number, since it uses as much as digits as its factorization.

212023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7311178.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 212023321 is about 14561.0206029660. The cubic root of 212023321 is about 596.2950592607.

Adding to 212023321 its reverse (123320212), we get a palindrome (335343533).

The spelling of 212023321 in words is "two hundred twelve million, twenty-three thousand, three hundred twenty-one".