21524242512 has 80 divisors (see below), whose sum is σ = 56310110208. Its totient is φ = 7084070400.

The previous prime is 21524242463. The next prime is 21524242547.

21524242512 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21524242512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1802353 + ... + 1814255.

Almost surely, 2^21524242512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21524242512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28155055104).

21524242512 is an abundant number, since it is smaller than the sum of its proper divisors (34785867696).

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

21524242512 is a wasteful number, since it uses less digits than its factorization.

21524242512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12388 (or 12382 counting only the distinct ones).

The product of its digits is 12800, while the sum is 30.

The spelling of 21524242512 in words is "twenty-one billion, five hundred twenty-four million, two hundred forty-two thousand, five hundred twelve".