11521075621440 has 896 divisors, whose sum is σ = 46476356567040. Its totient is φ = 2348448768000.

The previous prime is 11521075621439. The next prime is 11521075621481. The reversal of 11521075621440 is 4412657012511.

It is a Cunningham number, because it is equal to 3394271²-1.

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 127 ways as a sum of consecutive naturals, for example, 2280946915 + ... + 2280951965.

Almost surely, 2^{11521075621440} is an apocalyptic number.

11521075621440 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 11521075621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23238178283520).

11521075621440 is an abundant number, since it is smaller than the sum of its proper divisors (34955280945600).

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

11521075621440 is a wasteful number, since it uses less digits than its factorization.

11521075621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671 (or 5661 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 11521075621440 in words is "eleven trillion, five hundred twenty-one billion, seventy-five million, six hundred twenty-one thousand, four hundred forty".