211431323 has 4 divisors (see below), whose sum is σ = 211948680. Its totient is φ = 210913968.

The previous prime is 211431317. The next prime is 211431347. The reversal of 211431323 is 323134112.

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 211431323 - 2¹⁶ = 211365787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211431295 and 211431304.

It is not an unprimeable number, because it can be changed into a prime (211431313) 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, 258065 + ... + 258882.

It is an arithmetic number, because the mean of its divisors is an integer number (52987170).

Almost surely, 2^211431323 is an apocalyptic number.

211431323 is a deficient number, since it is larger than the sum of its proper divisors (517357).

211431323 is an equidigital number, since it uses as much as digits as its factorization.

211431323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517356.

The product of its digits is 432, while the sum is 20.

The square root of 211431323 is about 14540.6782166445. The cubic root of 211431323 is about 595.7395629158.

Adding to 211431323 its reverse (323134112), we get a palindrome (534565435).

The spelling of 211431323 in words is "two hundred eleven million, four hundred thirty-one thousand, three hundred twenty-three".