11521033540 has 24 divisors (see below), whose sum is σ = 24216151680. Its totient is φ = 4604226528.

The previous prime is 11521033499. The next prime is 11521033541. The reversal of 11521033540 is 4533012511.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11521033541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239070 + ... + 283189.

It is an arithmetic number, because the mean of its divisors is an integer number (1009006320).

Almost surely, 2^11521033540 is an apocalyptic number.

11521033540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11521033540 is an abundant number, since it is smaller than the sum of its proper divisors (12695118140).

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

11521033540 is a wasteful number, since it uses less digits than its factorization.

11521033540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523371 (or 523369 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 11521033540 in words is "eleven billion, five hundred twenty-one million, thirty-three thousand, five hundred forty".