213231023 has 4 divisors (see below), whose sum is σ = 218189928. Its totient is φ = 208272120.

The previous prime is 213231013. The next prime is 213231049. The reversal of 213231023 is 320132312.

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 213231023 - 2⁶ = 213230959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213230992 and 213231010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231013) 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, 2479388 + ... + 2479473.

It is an arithmetic number, because the mean of its divisors is an integer number (54547482).

Almost surely, 2^213231023 is an apocalyptic number.

213231023 is a deficient number, since it is larger than the sum of its proper divisors (4958905).

213231023 is an equidigital number, since it uses as much as digits as its factorization.

213231023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958904.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 213231023 is about 14602.4320919496. The cubic root of 213231023 is about 597.4250980143.

Adding to 213231023 its reverse (320132312), we get a palindrome (533363335).

The spelling of 213231023 in words is "two hundred thirteen million, two hundred thirty-one thousand, twenty-three".