11321213123 has 4 divisors (see below), whose sum is σ = 12350414328. Its totient is φ = 10292011920.

The previous prime is 11321213083. The next prime is 11321213131. The reversal of 11321213123 is 32131212311.

It is a happy number.

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 11321213123 - 2²⁸ = 11052777667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11321213095 and 11321213104.

It is not an unprimeable number, because it can be changed into a prime (11321213143) 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, 514600586 + ... + 514600607.

It is an arithmetic number, because the mean of its divisors is an integer number (3087603582).

Almost surely, 2^11321213123 is an apocalyptic number.

11321213123 is a deficient number, since it is larger than the sum of its proper divisors (1029201205).

11321213123 is a wasteful number, since it uses less digits than its factorization.

11321213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029201204.

The product of its digits is 216, while the sum is 20.

Adding to 11321213123 its reverse (32131212311), we get a palindrome (43452425434).

The spelling of 11321213123 in words is "eleven billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred twenty-three".