213420423 has 4 divisors (see below), whose sum is σ = 284560568. Its totient is φ = 142280280.

The previous prime is 213420419. The next prime is 213420439. The reversal of 213420423 is 324024312.

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

It is not a de Polignac number, because 213420423 - 2² = 213420419 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 213420423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213420413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35570068 + ... + 35570073.

It is an arithmetic number, because the mean of its divisors is an integer number (71140142).

Almost surely, 2^213420423 is an apocalyptic number.

213420423 is a deficient number, since it is larger than the sum of its proper divisors (71140145).

213420423 is an equidigital number, since it uses as much as digits as its factorization.

213420423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71140144.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 213420423 is about 14608.9158735342. The cubic root of 213420423 is about 597.6019309886.

Adding to 213420423 its reverse (324024312), we get a palindrome (537444735).

The spelling of 213420423 in words is "two hundred thirteen million, four hundred twenty thousand, four hundred twenty-three".