211121321 has 4 divisors (see below), whose sum is σ = 215613312. Its totient is φ = 206629332.

The previous prime is 211121311. The next prime is 211121327. The reversal of 211121321 is 123121112.

211121321 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 211121321 - 2⁶ = 211121257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121296 and 211121305.

It is not an unprimeable number, because it can be changed into a prime (211121327) 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, 2245925 + ... + 2246018.

It is an arithmetic number, because the mean of its divisors is an integer number (53903328).

Almost surely, 2^211121321 is an apocalyptic number.

It is an amenable number.

211121321 is a deficient number, since it is larger than the sum of its proper divisors (4491991).

211121321 is an equidigital number, since it uses as much as digits as its factorization.

211121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491990.

The product of its digits is 24, while the sum is 14.

The square root of 211121321 is about 14530.0144872605. The cubic root of 211121321 is about 595.4482614082.

Adding to 211121321 its reverse (123121112), we get a palindrome (334242433).

It can be divided in two parts, 2111 and 21321, that added together give a palindrome (23432).

The spelling of 211121321 in words is "two hundred eleven million, one hundred twenty-one thousand, three hundred twenty-one".