212323321 has 6 divisors (see below), whose sum is σ = 246988410. Its totient is φ = 181991376.

The previous prime is 212323291. The next prime is 212323333. The reversal of 212323321 is 123323212.

It can be written as a sum of positive squares in only one way, i.e., 172633321 + 39690000 = 13139^2 + 6300^2 .

It is not a de Polignac number, because 212323321 - 2⁷ = 212323193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212323381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2166516 + ... + 2166613.

It is an arithmetic number, because the mean of its divisors is an integer number (41164735).

Almost surely, 2^212323321 is an apocalyptic number.

It is an amenable number.

212323321 is a deficient number, since it is larger than the sum of its proper divisors (34665089).

212323321 is an equidigital number, since it uses as much as digits as its factorization.

212323321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4333143 (or 4333136 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 212323321 is about 14571.3184372589. The cubic root of 212323321 is about 596.5761670356.

Adding to 212323321 its reverse (123323212), we get a palindrome (335646533).

The spelling of 212323321 in words is "two hundred twelve million, three hundred twenty-three thousand, three hundred twenty-one".