21718848 has 112 divisors (see below), whose sum is σ = 61447680. Its totient is φ = 6758400.

The previous prime is 21718819. The next prime is 21718849. The reversal of 21718848 is 84881712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21718849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243988 + ... + 244076.

It is an arithmetic number, because the mean of its divisors is an integer number (548640).

Almost surely, 2^21718848 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 21718848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723840).

21718848 is an abundant number, since it is smaller than the sum of its proper divisors (39728832).

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

21718848 is a wasteful number, since it uses less digits than its factorization.

21718848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 166 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The square root of 21718848 is about 4660.3484848239. The cubic root of 21718848 is about 279.0051771242.

The spelling of 21718848 in words is "twenty-one million, seven hundred eighteen thousand, eight hundred forty-eight".