21371598860 has 48 divisors (see below), whose sum is σ = 46153166304. Its totient is φ = 8306800128.

The previous prime is 21371598821. The next prime is 21371598901. The reversal of 21371598860 is 6889517312.

It is a junction number, because it is equal to n+sod(n) for n = 21371598799 and 21371598808.

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 15 ways as a sum of consecutive naturals, for example, 564032 + ... + 600728.

It is an arithmetic number, because the mean of its divisors is an integer number (961524298).

Almost surely, 2^21371598860 is an apocalyptic number.

21371598860 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 21371598860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23076583152).

21371598860 is an abundant number, since it is smaller than the sum of its proper divisors (24781567444).

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

21371598860 is a wasteful number, since it uses less digits than its factorization.

21371598860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37530 (or 37528 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21371598860 in words is "twenty-one billion, three hundred seventy-one million, five hundred ninety-eight thousand, eight hundred sixty".