21673445152 has 96 divisors (see below), whose sum is σ = 45469347840. Its totient is φ = 10153693440.

The previous prime is 21673445147. The next prime is 21673445173. The reversal of 21673445152 is 25154437612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3918613 + ... + 3924139.

It is an arithmetic number, because the mean of its divisors is an integer number (473639040).

Almost surely, 2^21673445152 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 21673445152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22734673920).

21673445152 is an abundant number, since it is smaller than the sum of its proper divisors (23795902688).

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

21673445152 is a wasteful number, since it uses less digits than its factorization.

21673445152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694 (or 5686 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The spelling of 21673445152 in words is "twenty-one billion, six hundred seventy-three million, four hundred forty-five thousand, one hundred fifty-two".