21600744 has 64 divisors (see below), whose sum is σ = 62389440. Its totient is φ = 6159360.

The previous prime is 21600743. The next prime is 21600757. The reversal of 21600744 is 44700612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21600743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 6894.

It is an arithmetic number, because the mean of its divisors is an integer number (974835).

Almost surely, 2^21600744 is an apocalyptic number.

21600744 is a gapful number since it is divisible by the number (24) 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 21600744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31194720).

21600744 is an abundant number, since it is smaller than the sum of its proper divisors (40788696).

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

21600744 is a wasteful number, since it uses less digits than its factorization.

21600744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850 (or 4846 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21600744 is about 4647.6600564155. The cubic root of 21600744 is about 278.4985275190.

The spelling of 21600744 in words is "twenty-one million, six hundred thousand, seven hundred forty-four".