213213233231 has 4 divisors (see below), whose sum is σ = 213239367264. Its totient is φ = 213187099200.

The previous prime is 213213233213. The next prime is 213213233257. The reversal of 213213233231 is 132332312312.

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 213213233231 - 2¹⁰ = 213213232207 is a prime.

It is a super-2 number, since 2×213213233231² (a number of 23 digits) contains 22 as substring.

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 213213233231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213213233291) 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, 13054775 + ... + 13071096.

It is an arithmetic number, because the mean of its divisors is an integer number (53309841816).

Almost surely, 2^213213233231 is an apocalyptic number.

213213233231 is a deficient number, since it is larger than the sum of its proper divisors (26134033).

213213233231 is an equidigital number, since it uses as much as digits as its factorization.

213213233231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26134032.

The product of its digits is 3888, while the sum is 26.

Adding to 213213233231 its reverse (132332312312), we get a palindrome (345545545543).

The spelling of 213213233231 in words is "two hundred thirteen billion, two hundred thirteen million, two hundred thirty-three thousand, two hundred thirty-one".