21654451524 has 24 divisors (see below), whose sum is σ = 50660380960. Its totient is φ = 7199103744.

The previous prime is 21654451339. The next prime is 21654451531. The reversal of 21654451524 is 42515445612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2376109 + ... + 2385204.

Almost surely, 2^21654451524 is an apocalyptic number.

It is an amenable number.

21654451524 is an abundant number, since it is smaller than the sum of its proper divisors (29005929436).

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

21654451524 is a wasteful number, since it uses less digits than its factorization.

21654451524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761699 (or 4761697 counting only the distinct ones).

The product of its digits is 192000, while the sum is 39.

The spelling of 21654451524 in words is "twenty-one billion, six hundred fifty-four million, four hundred fifty-one thousand, five hundred twenty-four".