21199360 has 180 divisors, whose sum is σ = 64025478. Its totient is φ = 6709248.

The previous prime is 21199331. The next prime is 21199361. The reversal of 21199360 is 6399112.

It can be written as a sum of positive squares in 3 ways, for example, as 9144576 + 12054784 = 3024^2 + 3472^2 .

It is not an unprimeable number, because it can be changed into a prime (21199361) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1630714 + ... + 1630726.

Almost surely, 2^21199360 is an apocalyptic number.

21199360 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 21199360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32012739).

21199360 is an abundant number, since it is smaller than the sum of its proper divisors (42826118).

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

21199360 is an equidigital number, since it uses as much as digits as its factorization.

21199360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21199360 is about 4604.2762732052. The cubic root of 21199360 is about 276.7627156392.

The spelling of 21199360 in words is "twenty-one million, one hundred ninety-nine thousand, three hundred sixty".