11313223121 has 4 divisors (see below), whose sum is σ = 11978706852. Its totient is φ = 10647739392.

The previous prime is 11313223093. The next prime is 11313223133. The reversal of 11313223121 is 12132231311.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4342810000 + 6970413121 = 65900^2 + 83489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11313223121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11313223093 and 11313223102.

It is not an unprimeable number, because it can be changed into a prime (11313223921) 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, 332741840 + ... + 332741873.

It is an arithmetic number, because the mean of its divisors is an integer number (2994676713).

Almost surely, 2^11313223121 is an apocalyptic number.

It is an amenable number.

11313223121 is a deficient number, since it is larger than the sum of its proper divisors (665483731).

11313223121 is an equidigital number, since it uses as much as digits as its factorization.

11313223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665483730.

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

Adding to 11313223121 its reverse (12132231311), we get a palindrome (23445454432).

The spelling of 11313223121 in words is "eleven billion, three hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".