213231212133 has 4 divisors (see below), whose sum is σ = 284308282848. Its totient is φ = 142154141420.

The previous prime is 213231212123. The next prime is 213231212137. The reversal of 213231212133 is 331212132312.

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 213231212133 - 2⁸ = 213231211877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231212137) 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, 35538535353 + ... + 35538535358.

It is an arithmetic number, because the mean of its divisors is an integer number (71077070712).

Almost surely, 2^213231212133 is an apocalyptic number.

It is an amenable number.

213231212133 is a deficient number, since it is larger than the sum of its proper divisors (71077070715).

213231212133 is an equidigital number, since it uses as much as digits as its factorization.

213231212133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71077070714.

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

Adding to 213231212133 its reverse (331212132312), we get a palindrome (544443344445).

The spelling of 213231212133 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred twelve thousand, one hundred thirty-three".