11431220123 has 4 divisors (see below), whose sum is σ = 11451524808. Its totient is φ = 11410915440.

The previous prime is 11431220117. The next prime is 11431220183. The reversal of 11431220123 is 32102213411.

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 11431220123 - 2¹⁰ = 11431219099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11431220095 and 11431220104.

It is not an unprimeable number, because it can be changed into a prime (11431220113) 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, 10151498 + ... + 10152623.

It is an arithmetic number, because the mean of its divisors is an integer number (2862881202).

Almost surely, 2^11431220123 is an apocalyptic number.

11431220123 is a deficient number, since it is larger than the sum of its proper divisors (20304685).

11431220123 is an equidigital number, since it uses as much as digits as its factorization.

11431220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20304684.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 11431220123 its reverse (32102213411), we get a palindrome (43533433534).

The spelling of 11431220123 in words is "eleven billion, four hundred thirty-one million, two hundred twenty thousand, one hundred twenty-three".