212334521 has 4 divisors (see below), whose sum is σ = 242668032. Its totient is φ = 182001012.

The previous prime is 212334511. The next prime is 212334533. The reversal of 212334521 is 125433212.

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 212334521 - 2¹⁴ = 212318137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212334511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15166745 + ... + 15166758.

It is an arithmetic number, because the mean of its divisors is an integer number (60667008).

Almost surely, 2^212334521 is an apocalyptic number.

It is an amenable number.

212334521 is a deficient number, since it is larger than the sum of its proper divisors (30333511).

212334521 is an equidigital number, since it uses as much as digits as its factorization.

212334521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30333510.

The product of its digits is 1440, while the sum is 23.

The square root of 212334521 is about 14571.7027488211. The cubic root of 212334521 is about 596.5866565971.

Adding to 212334521 its reverse (125433212), we get a palindrome (337767733).

The spelling of 212334521 in words is "two hundred twelve million, three hundred thirty-four thousand, five hundred twenty-one".