21727392 has 48 divisors (see below), whose sum is σ = 57697920. Its totient is φ = 7158272.

The previous prime is 21727369. The next prime is 21727397. The reversal of 21727392 is 29372712.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (21727397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7273 + ... + 9815.

It is an arithmetic number, because the mean of its divisors is an integer number (1202040).

Almost surely, 2^21727392 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 21727392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28848960).

21727392 is an abundant number, since it is smaller than the sum of its proper divisors (35970528).

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

21727392 is a wasteful number, since it uses less digits than its factorization.

21727392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645 (or 2637 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 21727392 is about 4661.2650643361. The cubic root of 21727392 is about 279.0417583724.

The spelling of 21727392 in words is "twenty-one million, seven hundred twenty-seven thousand, three hundred ninety-two".