11111220113 has 4 divisors (see below), whose sum is σ = 12698537280. Its totient is φ = 9523902948.

The previous prime is 11111220073. The next prime is 11111220161. The reversal of 11111220113 is 31102211111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31102211111 = 1847 ⋅16839313.

It is not a de Polignac number, because 11111220113 - 2⁶ = 11111220049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111220163) 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, 793658573 + ... + 793658586.

It is an arithmetic number, because the mean of its divisors is an integer number (3174634320).

Almost surely, 2^11111220113 is an apocalyptic number.

It is an amenable number.

11111220113 is a deficient number, since it is larger than the sum of its proper divisors (1587317167).

11111220113 is an equidigital number, since it uses as much as digits as its factorization.

11111220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587317166.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11111220113 its reverse (31102211111), we get a palindrome (42213431224).

The spelling of 11111220113 in words is "eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred thirteen".