211313321 has 4 divisors (see below), whose sum is σ = 212855892. Its totient is φ = 209770752.

The previous prime is 211313299. The next prime is 211313339. The reversal of 211313321 is 123313112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78234025 + 133079296 = 8845^2 + 11536^2 .

It is a cyclic number.

It is not a de Polignac number, because 211313321 - 2⁶ = 211313257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211313321.

It is not an unprimeable number, because it can be changed into a prime (211313341) 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, 771080 + ... + 771353.

It is an arithmetic number, because the mean of its divisors is an integer number (53213973).

Almost surely, 2^211313321 is an apocalyptic number.

It is an amenable number.

211313321 is a deficient number, since it is larger than the sum of its proper divisors (1542571).

211313321 is a wasteful number, since it uses less digits than its factorization.

211313321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542570.

The product of its digits is 108, while the sum is 17.

The square root of 211313321 is about 14536.6199991607. The cubic root of 211313321 is about 595.6287128282.

Adding to 211313321 its reverse (123313112), we get a palindrome (334626433).

The spelling of 211313321 in words is "two hundred eleven million, three hundred thirteen thousand, three hundred twenty-one".