11521340443531 has 16 divisors (see below), whose sum is σ = 12347111345184. Its totient is φ = 10712644153344.

The previous prime is 11521340443499. The next prime is 11521340443597. The reversal of 11521340443531 is 13534404312511.

It is a happy number.

It is not a de Polignac number, because 11521340443531 - 2⁵ = 11521340443499 is a prime.

It is a super-2 number, since 2×11521340443531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11521340443631) by changing a digit.

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, 9178290 + ... + 10357783.

It is an arithmetic number, because the mean of its divisors is an integer number (771694459074).

Almost surely, 2^{11521340443531} is an apocalyptic number.

11521340443531 is a deficient number, since it is larger than the sum of its proper divisors (825770901653).

11521340443531 is a wasteful number, since it uses less digits than its factorization.

11521340443531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19536510.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 11521340443531 in words is "eleven trillion, five hundred twenty-one billion, three hundred forty million, four hundred forty-three thousand, five hundred thirty-one".