21169017792 has 224 divisors, whose sum is σ = 68834203200. Its totient is φ = 6337253376.

The previous prime is 21169017767. The next prime is 21169017803. The reversal of 21169017792 is 29771096112.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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, 818434 + ... + 843902.

It is an arithmetic number, because the mean of its divisors is an integer number (307295550).

Almost surely, 2^21169017792 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 21169017792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34417101600).

21169017792 is an abundant number, since it is smaller than the sum of its proper divisors (47665185408).

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

21169017792 is a wasteful number, since it uses less digits than its factorization.

21169017792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25540 (or 25524 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The spelling of 21169017792 in words is "twenty-one billion, one hundred sixty-nine million, seventeen thousand, seven hundred ninety-two".