211111321 has 12 divisors (see below), whose sum is σ = 226389168. Its totient is φ = 196807232.

The previous prime is 211111289. The next prime is 211111343. The reversal of 211111321 is 123111112.

It is a happy number.

211111321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211111321 - 2⁵ = 211111289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27510 + ... + 34336.

It is an arithmetic number, because the mean of its divisors is an integer number (18865764).

Almost surely, 2^211111321 is an apocalyptic number.

It is an amenable number.

211111321 is a deficient number, since it is larger than the sum of its proper divisors (15277847).

211111321 is a wasteful number, since it uses less digits than its factorization.

211111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6968 (or 6951 counting only the distinct ones).

The product of its digits is 12, while the sum is 13.

The square root of 211111321 is about 14529.6703679058. The cubic root of 211111321 is about 595.4388598997.

Adding to 211111321 its reverse (123111112), we get a palindrome (334222433).

The spelling of 211111321 in words is "two hundred eleven million, one hundred eleven thousand, three hundred twenty-one".