211042423 has 4 divisors (see below), whose sum is σ = 211721328. Its totient is φ = 210363520.

The previous prime is 211042397. The next prime is 211042427. The reversal of 211042423 is 324240112.

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 211042423 - 2²⁵ = 177487991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211042423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211042427) 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, 338986 + ... + 339607.

It is an arithmetic number, because the mean of its divisors is an integer number (52930332).

Almost surely, 2^211042423 is an apocalyptic number.

211042423 is a deficient number, since it is larger than the sum of its proper divisors (678905).

211042423 is an equidigital number, since it uses as much as digits as its factorization.

211042423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678904.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 211042423 is about 14527.2992328237. The cubic root of 211042423 is about 595.3740773163.

Adding to 211042423 its reverse (324240112), we get a palindrome (535282535).

The spelling of 211042423 in words is "two hundred eleven million, forty-two thousand, four hundred twenty-three".