17921000432 has 80 divisors (see below), whose sum is σ = 37246366080. Its totient is φ = 8323485696.

The previous prime is 17921000429. The next prime is 17921000441. The reversal of 17921000432 is 23400012971.

It is a junction number, because it is equal to n+sod(n) for n = 17921000395 and 17921000404.

It is a congruent number.

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, 8685833 + ... + 8687895.

It is an arithmetic number, because the mean of its divisors is an integer number (465579576).

Almost surely, 2^17921000432 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 17921000432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18623183040).

17921000432 is an abundant number, since it is smaller than the sum of its proper divisors (19325365648).

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

17921000432 is a wasteful number, since it uses less digits than its factorization.

17921000432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2484 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The spelling of 17921000432 in words is "seventeen billion, nine hundred twenty-one million, four hundred thirty-two", and thus it is an aban number.