21454525521 has 48 divisors (see below), whose sum is σ = 38549347200. Its totient is φ = 11296488960.

The previous prime is 21454525501. The next prime is 21454525523. The reversal of 21454525521 is 12552545412.

21454525521 is a `hidden beast` number, since 2 + 1 + 4 + 54 + 52 + 552 + 1 = 666.

It is not a de Polignac number, because 21454525521 - 2⁹ = 21454525009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21454525523) 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 47 ways as a sum of consecutive naturals, for example, 468421 + ... + 512178.

It is an arithmetic number, because the mean of its divisors is an integer number (803111400).

Almost surely, 2^21454525521 is an apocalyptic number.

It is an amenable number.

21454525521 is a deficient number, since it is larger than the sum of its proper divisors (17094821679).

21454525521 is a wasteful number, since it uses less digits than its factorization.

21454525521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980646 (or 980643 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The spelling of 21454525521 in words is "twenty-one billion, four hundred fifty-four million, five hundred twenty-five thousand, five hundred twenty-one".