21524241828 has 48 divisors (see below), whose sum is σ = 51464206080. Its totient is φ = 6997574400.

The previous prime is 21524241821. The next prime is 21524241829. The reversal of 21524241828 is 82814242512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21524241821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2548773 + ... + 2557203.

It is an arithmetic number, because the mean of its divisors is an integer number (1072170960).

Almost surely, 2^21524241828 is an apocalyptic number.

It is an amenable number.

21524241828 is an abundant number, since it is smaller than the sum of its proper divisors (29939964252).

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

21524241828 is a wasteful number, since it uses less digits than its factorization.

21524241828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13668 (or 13666 counting only the distinct ones).

The product of its digits is 81920, while the sum is 39.

The spelling of 21524241828 in words is "twenty-one billion, five hundred twenty-four million, two hundred forty-one thousand, eight hundred twenty-eight".