11123021205 has 48 divisors (see below), whose sum is σ = 20503482480. Its totient is φ = 5558851584.

The previous prime is 11123021177. The next prime is 11123021209. The reversal of 11123021205 is 50212032111.

It can be written as a sum of positive squares in 8 ways, for example, as 10909809 + 11112111396 = 3303^2 + 105414^2 .

It is not a de Polignac number, because 11123021205 - 2⁸ = 11123020949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123021209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 143439 + ... + 206931.

It is an arithmetic number, because the mean of its divisors is an integer number (427155885).

Almost surely, 2^11123021205 is an apocalyptic number.

11123021205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11123021205 is a deficient number, since it is larger than the sum of its proper divisors (9380461275).

11123021205 is a wasteful number, since it uses less digits than its factorization.

11123021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63750 (or 63747 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 11123021205 its reverse (50212032111), we get a palindrome (61335053316).

The spelling of 11123021205 in words is "eleven billion, one hundred twenty-three million, twenty-one thousand, two hundred five".