211323421 has 4 divisors (see below), whose sum is σ = 215819712. Its totient is φ = 206827132.

The previous prime is 211323407. The next prime is 211323433. The reversal of 211323421 is 124323112.

It is a happy number.

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 211323421 - 2²³ = 202934813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211323401) 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, 2248075 + ... + 2248168.

It is an arithmetic number, because the mean of its divisors is an integer number (53954928).

Almost surely, 2^211323421 is an apocalyptic number.

It is an amenable number.

211323421 is a deficient number, since it is larger than the sum of its proper divisors (4496291).

211323421 is an equidigital number, since it uses as much as digits as its factorization.

211323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496290.

The product of its digits is 288, while the sum is 19.

The square root of 211323421 is about 14536.9673935109. The cubic root of 211323421 is about 595.6382022980.

Adding to 211323421 its reverse (124323112), we get a palindrome (335646533).

The spelling of 211323421 in words is "two hundred eleven million, three hundred twenty-three thousand, four hundred twenty-one".