11011243520 has 80 divisors (see below), whose sum is σ = 26496862128. Its totient is φ = 4388536320.

The previous prime is 11011243511. The next prime is 11011243559. The reversal of 11011243520 is 2534211011.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a junction number, because it is equal to n+sod(n) for n = 11011243492 and 11011243501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711707 + ... + 727013.

Almost surely, 2^11011243520 is an apocalyptic number.

11011243520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11011243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13248431064).

11011243520 is an abundant number, since it is smaller than the sum of its proper divisors (15485618608).

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

11011243520 is an equidigital number, since it uses as much as digits as its factorization.

11011243520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15611 (or 15595 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 11011243520 its reverse (2534211011), we get a palindrome (13545454531).

The spelling of 11011243520 in words is "eleven billion, eleven million, two hundred forty-three thousand, five hundred twenty".