211321 has 4 divisors (see below), whose sum is σ = 230544. Its totient is φ = 192100.

The previous prime is 211319. The next prime is 211333. The reversal of 211321 is 123112.

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 211321 - 2¹ = 211319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211298 and 211307.

It is not an unprimeable number, because it can be changed into a prime (241321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9595 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (57636).

2²¹¹³²¹ is an apocalyptic number.

It is an amenable number.

211321 is a deficient number, since it is larger than the sum of its proper divisors (19223).

211321 is a wasteful number, since it uses less digits than its factorization.

211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19222.

The product of its digits is 12, while the sum is 10.

The square root of 211321 is about 459.6966391002. The cubic root of 211321 is about 59.5635927671.

Adding to 211321 its reverse (123112), we get a palindrome (334433).

Subtracting from 211321 its reverse (123112), we obtain a square (88209 = 297²).

The spelling of 211321 in words is "two hundred eleven thousand, three hundred twenty-one", and thus it is an iban number.