11143123220 has 12 divisors (see below), whose sum is σ = 23400558804. Its totient is φ = 4457249280.

The previous prime is 11143123217. The next prime is 11143123231. The reversal of 11143123220 is 2232134111.

It can be written as a sum of positive squares in 2 ways, for example, as 7794417796 + 3348705424 = 88286^2 + 57868^2 .

It is a super-2 number, since 2×11143123220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 557156161 = 11143123220 / (1 + 1 + 1 + 4 + 3 + 1 + 2 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 11143123192 and 11143123201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278578061 + ... + 278578100.

It is an arithmetic number, because the mean of its divisors is an integer number (1950046567).

Almost surely, 2^11143123220 is an apocalyptic number.

11143123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11143123220 is an abundant number, since it is smaller than the sum of its proper divisors (12257435584).

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

11143123220 is a wasteful number, since it uses less digits than its factorization.

11143123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557156170 (or 557156168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 11143123220 its reverse (2232134111), we get a palindrome (13375257331).

The spelling of 11143123220 in words is "eleven billion, one hundred forty-three million, one hundred twenty-three thousand, two hundred twenty".