11521343424 has 112 divisors (see below), whose sum is σ = 32128358400. Its totient is φ = 3633739776.

The previous prime is 11521343423. The next prime is 11521343429. The reversal of 11521343424 is 42434312511.

It is a junction number, because it is equal to n+sod(n) for n = 11521343391 and 11521343400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521343423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4000417 + ... + 4003295.

Almost surely, 2^11521343424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11521343424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16064179200).

11521343424 is an abundant number, since it is smaller than the sum of its proper divisors (20607014976).

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

11521343424 is a wasteful number, since it uses less digits than its factorization.

11521343424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010 (or 4000 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

Adding to 11521343424 its reverse (42434312511), we get a palindrome (53955655935).

The spelling of 11521343424 in words is "eleven billion, five hundred twenty-one million, three hundred forty-three thousand, four hundred twenty-four".