11113213121 has 8 divisors (see below), whose sum is σ = 11374521600. Its totient is φ = 10852940448.

The previous prime is 11113213099. The next prime is 11113213169. The reversal of 11113213121 is 12131231111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11113213121 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 11113213121.

It is not an unprimeable number, because it can be changed into a prime (11113219121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237221 + ... + 280178.

It is an arithmetic number, because the mean of its divisors is an integer number (1421815200).

Almost surely, 2^11113213121 is an apocalyptic number.

It is an amenable number.

11113213121 is a deficient number, since it is larger than the sum of its proper divisors (261308479).

11113213121 is an equidigital number, since it uses as much as digits as its factorization.

11113213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517903.

The product of its digits is 36, while the sum is 17.

Adding to 11113213121 its reverse (12131231111), we get a palindrome (23244444232).

The spelling of 11113213121 in words is "eleven billion, one hundred thirteen million, two hundred thirteen thousand, one hundred twenty-one".