11100421231 has 4 divisors (see below), whose sum is σ = 11256765264. Its totient is φ = 10944077200.

The previous prime is 11100421187. The next prime is 11100421249. The reversal of 11100421231 is 13212400111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11100421231 is a prime.

It is a super-2 number, since 2×11100421231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100421831) 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, 78171910 + ... + 78172051.

It is an arithmetic number, because the mean of its divisors is an integer number (2814191316).

Almost surely, 2^11100421231 is an apocalyptic number.

11100421231 is a deficient number, since it is larger than the sum of its proper divisors (156344033).

11100421231 is an equidigital number, since it uses as much as digits as its factorization.

11100421231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156344032.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11100421231 its reverse (13212400111), we get a palindrome (24312821342).

The spelling of 11100421231 in words is "eleven billion, one hundred million, four hundred twenty-one thousand, two hundred thirty-one".