213431423 has 4 divisors (see below), whose sum is σ = 213938808. Its totient is φ = 212924040.

The previous prime is 213431417. The next prime is 213431441. The reversal of 213431423 is 324134312.

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 213431423 - 2⁶ = 213431359 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 (213431443) 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, 253061 + ... + 253902.

It is an arithmetic number, because the mean of its divisors is an integer number (53484702).

Almost surely, 2^213431423 is an apocalyptic number.

213431423 is a deficient number, since it is larger than the sum of its proper divisors (507385).

213431423 is an equidigital number, since it uses as much as digits as its factorization.

213431423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507384.

The product of its digits is 1728, while the sum is 23.

The square root of 213431423 is about 14609.2923511031. The cubic root of 213431423 is about 597.6121979040.

Adding to 213431423 its reverse (324134312), we get a palindrome (537565735).

The spelling of 213431423 in words is "two hundred thirteen million, four hundred thirty-one thousand, four hundred twenty-three".