11521234134531 has 20 divisors (see below), whose sum is σ = 18775344516984. Its totient is φ = 6982566141600.

The previous prime is 11521234134523. The next prime is 11521234134649. The reversal of 11521234134531 is 13543143212511.

11521234134531 is a `hidden beast` number, since 1 + 1 + 52 + 1 + 2 + 3 + 41 + 34 + 531 = 666.

11521234134531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11521234134531 - 2³ = 11521234134523 is a prime.

It is a super-2 number, since 2×11521234134531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11521234134931) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6465338130 + ... + 6465339911.

Almost surely, 2^{11521234134531} is an apocalyptic number.

11521234134531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11521234134531 is a deficient number, since it is larger than the sum of its proper divisors (7254110382453).

11521234134531 is a wasteful number, since it uses less digits than its factorization.

11521234134531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12930678064 (or 12930678055 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 11521234134531 in words is "eleven trillion, five hundred twenty-one billion, two hundred thirty-four million, one hundred thirty-four thousand, five hundred thirty-one".