11123220440 has 64 divisors (see below), whose sum is σ = 26558150400. Its totient is φ = 4183687552.

The previous prime is 11123220439. The next prime is 11123220481. The reversal of 11123220440 is 4402232111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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, 48182 + ... + 156741.

It is an arithmetic number, because the mean of its divisors is an integer number (414971100).

Almost surely, 2^11123220440 is an apocalyptic number.

11123220440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11123220440 is an abundant number, since it is smaller than the sum of its proper divisors (15434929960).

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

11123220440 is a wasteful number, since it uses less digits than its factorization.

11123220440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205016 (or 205012 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 11123220440 its reverse (4402232111), we get a palindrome (15525452551).

The spelling of 11123220440 in words is "eleven billion, one hundred twenty-three million, two hundred twenty thousand, four hundred forty".