11121215243 has 4 divisors (see below), whose sum is σ = 11124662640. Its totient is φ = 11117767848.

The previous prime is 11121215239. The next prime is 11121215293. The reversal of 11121215243 is 34251212111.

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 11121215243 - 2² = 11121215239 is a prime.

It is a super-2 number, since 2×11121215243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121215293) 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, 1718855 + ... + 1725312.

It is an arithmetic number, because the mean of its divisors is an integer number (2781165660).

Almost surely, 2^11121215243 is an apocalyptic number.

11121215243 is a deficient number, since it is larger than the sum of its proper divisors (3447397).

11121215243 is an equidigital number, since it uses as much as digits as its factorization.

11121215243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447396.

The product of its digits is 480, while the sum is 23.

Adding to 11121215243 its reverse (34251212111), we get a palindrome (45372427354).

The spelling of 11121215243 in words is "eleven billion, one hundred twenty-one million, two hundred fifteen thousand, two hundred forty-three".