11223123231 has 4 divisors (see below), whose sum is σ = 14964164312. Its totient is φ = 7482082152.

The previous prime is 11223123227. The next prime is 11223123341. The reversal of 11223123231 is 13232132211.

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

It is not a de Polignac number, because 11223123231 - 2² = 11223123227 is a prime.

It is a super-2 number, since 2×11223123231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11223123198 and 11223123207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223123931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870520536 + ... + 1870520541.

It is an arithmetic number, because the mean of its divisors is an integer number (3741041078).

Almost surely, 2^11223123231 is an apocalyptic number.

11223123231 is a deficient number, since it is larger than the sum of its proper divisors (3741041081).

11223123231 is an equidigital number, since it uses as much as digits as its factorization.

11223123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741041080.

The product of its digits is 432, while the sum is 21.

Adding to 11223123231 its reverse (13232132211), we get a palindrome (24455255442).

The spelling of 11223123231 in words is "eleven billion, two hundred twenty-three million, one hundred twenty-three thousand, two hundred thirty-one".