21323872860 has 192 divisors, whose sum is σ = 62962099200. Its totient is φ = 5386106880.

The previous prime is 21323872847. The next prime is 21323872879. The reversal of 21323872860 is 6827832312.

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 63 ways as a sum of consecutive naturals, for example, 21049714 + ... + 21050726.

It is an arithmetic number, because the mean of its divisors is an integer number (327927600).

Almost surely, 2^21323872860 is an apocalyptic number.

21323872860 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 21323872860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31481049600).

21323872860 is an abundant number, since it is smaller than the sum of its proper divisors (41638226340).

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

21323872860 is a wasteful number, since it uses less digits than its factorization.

21323872860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 21323872860 in words is "twenty-one billion, three hundred twenty-three million, eight hundred seventy-two thousand, eight hundred sixty".