213143321 has 4 divisors (see below), whose sum is σ = 220018944. Its totient is φ = 206267700.

The previous prime is 213143317. The next prime is 213143339. The reversal of 213143321 is 123341312.

213143321 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 213143321 - 2² = 213143317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213143293 and 213143302.

It is not an unprimeable number, because it can be changed into a prime (213143351) 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, 3437765 + ... + 3437826.

It is an arithmetic number, because the mean of its divisors is an integer number (55004736).

Almost surely, 2^213143321 is an apocalyptic number.

It is an amenable number.

213143321 is a deficient number, since it is larger than the sum of its proper divisors (6875623).

213143321 is an equidigital number, since it uses as much as digits as its factorization.

213143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875622.

The product of its digits is 432, while the sum is 20.

The square root of 213143321 is about 14599.4287901959. The cubic root of 213143321 is about 597.3431797264.

Adding to 213143321 its reverse (123341312), we get a palindrome (336484633).

The spelling of 213143321 in words is "two hundred thirteen million, one hundred forty-three thousand, three hundred twenty-one".