11123123223220 has 12 divisors (see below), whose sum is σ = 23358558768804. Its totient is φ = 4449249289280.

The previous prime is 11123123223187. The next prime is 11123123223221. The reversal of 11123123223220 is 2232232132111.

It can be written as a sum of positive squares in 2 ways, for example, as 7672490045476 + 3450633177744 = 2769926^2 + 1857588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123123223221) 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, 278078080561 + ... + 278078080600.

It is an arithmetic number, because the mean of its divisors is an integer number (1946546564067).

Almost surely, 2^{11123123223220} is an apocalyptic number.

11123123223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11123123223220 is an abundant number, since it is smaller than the sum of its proper divisors (12235435545584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11123123223220 is a wasteful number, since it uses less digits than its factorization.

11123123223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556156161170 (or 556156161168 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 11123123223220 its reverse (2232232132111), we get a palindrome (13355355355331).

The spelling of 11123123223220 in words is "eleven trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty".