211221323 has 4 divisors (see below), whose sum is σ = 212315928. Its totient is φ = 210126720.

The previous prime is 211221313. The next prime is 211221331. The reversal of 211221323 is 323122112.

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

It is a cyclic number.

It is not a de Polignac number, because 211221323 - 2¹⁸ = 210959179 is a prime.

It is a super-2 number, since 2×211221323² = 89228894579740658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547013 + ... + 547398.

It is an arithmetic number, because the mean of its divisors is an integer number (53078982).

Almost surely, 2^211221323 is an apocalyptic number.

211221323 is a deficient number, since it is larger than the sum of its proper divisors (1094605).

211221323 is a wasteful number, since it uses less digits than its factorization.

211221323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094604.

The product of its digits is 144, while the sum is 17.

The square root of 211221323 is about 14533.4553014760. The cubic root of 211221323 is about 595.5422620480.

Adding to 211221323 its reverse (323122112), we get a palindrome (534343435).

The spelling of 211221323 in words is "two hundred eleven million, two hundred twenty-one thousand, three hundred twenty-three".