11123023221 has 16 divisors (see below), whose sum is σ = 16663708800. Its totient is φ = 7332028704.

The previous prime is 11123023217. The next prime is 11123023267. The reversal of 11123023221 is 12232032111.

11123023221 is a `hidden beast` number, since 111 + 230 + 2 + 322 + 1 = 666.

It is not a de Polignac number, because 11123023221 - 2² = 11123023217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11123023194 and 11123023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123023421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2312001 + ... + 2316806.

It is an arithmetic number, because the mean of its divisors is an integer number (1041481800).

Almost surely, 2^11123023221 is an apocalyptic number.

It is an amenable number.

11123023221 is a deficient number, since it is larger than the sum of its proper divisors (5540685579).

11123023221 is an equidigital number, since it uses as much as digits as its factorization.

11123023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628905 (or 4628899 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11123023221 its reverse (12232032111), we get a palindrome (23355055332).

The spelling of 11123023221 in words is "eleven billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty-one".