11201242123 has 4 divisors (see below), whose sum is σ = 11412586368. Its totient is φ = 10989897880.

The previous prime is 11201242111. The next prime is 11201242127. The reversal of 11201242123 is 32124210211.

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 11201242123 - 2¹³ = 11201233931 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 11201242123.

It is not an unprimeable number, because it can be changed into a prime (11201242127) 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, 105672043 + ... + 105672148.

It is an arithmetic number, because the mean of its divisors is an integer number (2853146592).

Almost surely, 2^11201242123 is an apocalyptic number.

11201242123 is a deficient number, since it is larger than the sum of its proper divisors (211344245).

11201242123 is an equidigital number, since it uses as much as digits as its factorization.

11201242123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211344244.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11201242123 its reverse (32124210211), we get a palindrome (43325452334).

The spelling of 11201242123 in words is "eleven billion, two hundred one million, two hundred forty-two thousand, one hundred twenty-three".