21673744080 has 160 divisors (see below), whose sum is σ = 69880229760. Its totient is φ = 5552547840.

The previous prime is 21673744073. The next prime is 21673744111. The reversal of 21673744080 is 8044737612.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 612306 + ... + 646734.

It is an arithmetic number, because the mean of its divisors is an integer number (436751436).

Almost surely, 2^21673744080 is an apocalyptic number.

21673744080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21673744080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34940114880).

21673744080 is an abundant number, since it is smaller than the sum of its proper divisors (48206485680).

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

21673744080 is a wasteful number, since it uses less digits than its factorization.

21673744080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34549 (or 34543 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21673744080 in words is "twenty-one billion, six hundred seventy-three million, seven hundred forty-four thousand, eighty".