213212321 has 8 divisors (see below), whose sum is σ = 252073920. Its totient is φ = 176451408.

The previous prime is 213212303. The next prime is 213212339. The reversal of 213212321 is 123212312.

213212321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213212303) and next prime (213212339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213212321 - 2¹⁴ = 213195937 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213212321.

It is not an unprimeable number, because it can be changed into a prime (213212621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524951 + ... + 525356.

It is an arithmetic number, because the mean of its divisors is an integer number (31509240).

Almost surely, 2^213212321 is an apocalyptic number.

It is an amenable number.

213212321 is a deficient number, since it is larger than the sum of its proper divisors (38861599).

213212321 is a wasteful number, since it uses less digits than its factorization.

213212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050343.

The product of its digits is 144, while the sum is 17.

The square root of 213212321 is about 14601.7917051299. The cubic root of 213212321 is about 597.4076312457.

Adding to 213212321 its reverse (123212312), we get a palindrome (336424633).

Subtracting from 213212321 its reverse (123212312), we obtain a palindrome (90000009).

The spelling of 213212321 in words is "two hundred thirteen million, two hundred twelve thousand, three hundred twenty-one".