212542321 has 4 divisors (see below), whose sum is σ = 212626944. Its totient is φ = 212457700.

The previous prime is 212542307. The next prime is 212542331. The reversal of 212542321 is 123245212.

It is a happy number.

212542321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212542321 - 2¹⁷ = 212411249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212542292 and 212542301.

It is not an unprimeable number, because it can be changed into a prime (212542301) 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, 38425 + ... + 43606.

It is an arithmetic number, because the mean of its divisors is an integer number (53156736).

Almost surely, 2^212542321 is an apocalyptic number.

It is an amenable number.

212542321 is a deficient number, since it is larger than the sum of its proper divisors (84623).

212542321 is an equidigital number, since it uses as much as digits as its factorization.

212542321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84622.

The product of its digits is 960, while the sum is 22.

The square root of 212542321 is about 14578.8312631706. The cubic root of 212542321 is about 596.7812085515.

Adding to 212542321 its reverse (123245212), we get a palindrome (335787533).

The spelling of 212542321 in words is "two hundred twelve million, five hundred forty-two thousand, three hundred twenty-one".