21654425604 has 96 divisors (see below), whose sum is σ = 58892230656. Its totient is φ = 6064306560.

The previous prime is 21654425593. The next prime is 21654425627. The reversal of 21654425604 is 40652445612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6618489 + ... + 6621759.

It is an arithmetic number, because the mean of its divisors is an integer number (613460736).

Almost surely, 2^21654425604 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 21654425604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29446115328).

21654425604 is an abundant number, since it is smaller than the sum of its proper divisors (37237805052).

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

21654425604 is a wasteful number, since it uses less digits than its factorization.

21654425604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4823 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

The spelling of 21654425604 in words is "twenty-one billion, six hundred fifty-four million, four hundred twenty-five thousand, six hundred four".