213231312213 has 4 divisors (see below), whose sum is σ = 284308416288. Its totient is φ = 142154208140.

The previous prime is 213231312209. The next prime is 213231312221. The reversal of 213231312213 is 312213132312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213231312213 - 2² = 213231312209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231312223) 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, 35538552033 + ... + 35538552038.

It is an arithmetic number, because the mean of its divisors is an integer number (71077104072).

Almost surely, 2^213231312213 is an apocalyptic number.

It is an amenable number.

213231312213 is a deficient number, since it is larger than the sum of its proper divisors (71077104075).

213231312213 is an equidigital number, since it uses as much as digits as its factorization.

213231312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71077104074.

The product of its digits is 1296, while the sum is 24.

Adding to 213231312213 its reverse (312213132312), we get a palindrome (525444444525).

The spelling of 213231312213 in words is "two hundred thirteen billion, two hundred thirty-one million, three hundred twelve thousand, two hundred thirteen".