11481724521 has 12 divisors (see below), whose sum is σ = 16590695940. Its totient is φ = 7651721760.

The previous prime is 11481724511. The next prime is 11481724543. The reversal of 11481724521 is 12542718411.

11481724521 is a `hidden beast` number, since 114 + 8 + 17 + 2 + 4 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5907459600 + 5574264921 = 76860^2 + 74661^2 .

It is not a de Polignac number, because 11481724521 - 2²² = 11477530217 is a prime.

It is a super-2 number, since 2×11481724521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11481724511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203610 + ... + 253811.

It is an arithmetic number, because the mean of its divisors is an integer number (1382557995).

Almost surely, 2^11481724521 is an apocalyptic number.

It is an amenable number.

11481724521 is a deficient number, since it is larger than the sum of its proper divisors (5108971419).

11481724521 is a wasteful number, since it uses less digits than its factorization.

11481724521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460216 (or 460213 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The spelling of 11481724521 in words is "eleven billion, four hundred eighty-one million, seven hundred twenty-four thousand, five hundred twenty-one".