11231211223 has 4 divisors (see below), whose sum is σ = 11290013568. Its totient is φ = 11172408880.

The previous prime is 11231211217. The next prime is 11231211269. The reversal of 11231211223 is 32211213211.

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-11231211223 is a prime.

It is a super-2 number, since 2×11231211223² (a number of 21 digits) contains 22 as substring.

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 11231211223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271211223) 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, 29400886 + ... + 29401267.

It is an arithmetic number, because the mean of its divisors is an integer number (2822503392).

Almost surely, 2^11231211223 is an apocalyptic number.

11231211223 is a deficient number, since it is larger than the sum of its proper divisors (58802345).

11231211223 is an equidigital number, since it uses as much as digits as its factorization.

11231211223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58802344.

The product of its digits is 144, while the sum is 19.

Adding to 11231211223 its reverse (32211213211), we get a palindrome (43442424434).

The spelling of 11231211223 in words is "eleven billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty-three".