213423243231 has 32 divisors (see below), whose sum is σ = 319585593600. Its totient is φ = 125550881280.

The previous prime is 213423243221. The next prime is 213423243311. The reversal of 213423243231 is 132342324312.

It is a happy number.

It is not a de Polignac number, because 213423243231 - 2⁶ = 213423243167 is a prime.

It is a super-2 number, since 2×213423243231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213423243221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303015 + ... + 720183.

It is an arithmetic number, because the mean of its divisors is an integer number (9987049800).

Almost surely, 2^213423243231 is an apocalyptic number.

213423243231 is a deficient number, since it is larger than the sum of its proper divisors (106162350369).

213423243231 is a wasteful number, since it uses less digits than its factorization.

213423243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417639.

The product of its digits is 20736, while the sum is 30.

Adding to 213423243231 its reverse (132342324312), we get a palindrome (345765567543).

It can be divided in two parts, 213423 and 243231, that added together give a palindrome (456654).

The spelling of 213423243231 in words is "two hundred thirteen billion, four hundred twenty-three million, two hundred forty-three thousand, two hundred thirty-one".