11557212111 has 20 divisors (see below), whose sum is σ = 17287375512. Its totient is φ = 7694589168.

The previous prime is 11557212103. The next prime is 11557212127. The reversal of 11557212111 is 11121275511.

It is not a de Polignac number, because 11557212111 - 2³ = 11557212103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11557212131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32925 + ... + 155558.

Almost surely, 2^11557212111 is an apocalyptic number.

11557212111 is a deficient number, since it is larger than the sum of its proper divisors (5730163401).

11557212111 is an equidigital number, since it uses as much as digits as its factorization.

11557212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189252 (or 189243 counting only the distinct ones).

The product of its digits is 700, while the sum is 27.

Adding to 11557212111 its reverse (11121275511), we get a palindrome (22678487622).

The spelling of 11557212111 in words is "eleven billion, five hundred fifty-seven million, two hundred twelve thousand, one hundred eleven".