213120213123 has 4 divisors (see below), whose sum is σ = 284160284168. Its totient is φ = 142080142080.

The previous prime is 213120213109. The next prime is 213120213181. The reversal of 213120213123 is 321312021312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213120213123 - 2⁴ = 213120213107 is a prime.

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 213120213123.

It is not an unprimeable number, because it can be changed into a prime (213120213223) 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, 35520035518 + ... + 35520035523.

It is an arithmetic number, because the mean of its divisors is an integer number (71040071042).

Almost surely, 2^213120213123 is an apocalyptic number.

213120213123 is a deficient number, since it is larger than the sum of its proper divisors (71040071045).

213120213123 is an equidigital number, since it uses as much as digits as its factorization.

213120213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71040071044.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213120213123 its reverse (321312021312), we get a palindrome (534432234435).

It can be divided in two parts, 21312021312 and 3, that multiplied together give a palindrome (63936063936).

The spelling of 213120213123 in words is "two hundred thirteen billion, one hundred twenty million, two hundred thirteen thousand, one hundred twenty-three".