213123143 has 4 divisors (see below), whose sum is σ = 213166008. Its totient is φ = 213080280.

The previous prime is 213123137. The next prime is 213123149. The reversal of 213123143 is 341321312.

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

It is an interprime number because it is at equal distance from previous prime (213123137) and next prime (213123149).

It is a cyclic number.

It is not a de Polignac number, because 213123143 - 2²⁰ = 212074567 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 (213123149) 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, 12821 + ... + 24302.

It is an arithmetic number, because the mean of its divisors is an integer number (53291502).

Almost surely, 2^213123143 is an apocalyptic number.

213123143 is a deficient number, since it is larger than the sum of its proper divisors (42865).

213123143 is an equidigital number, since it uses as much as digits as its factorization.

213123143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42864.

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

The square root of 213123143 is about 14598.7377194057. The cubic root of 213123143 is about 597.3243292318.

Adding to 213123143 its reverse (341321312), we get a palindrome (554444455).

The spelling of 213123143 in words is "two hundred thirteen million, one hundred twenty-three thousand, one hundred forty-three".