21841488 has 100 divisors (see below), whose sum is σ = 66617760. Its totient is φ = 6889536.

The previous prime is 21841441. The next prime is 21841489. The reversal of 21841488 is 88414812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841489) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24181 + ... + 25067.

Almost surely, 2^21841488 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 21841488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33308880).

21841488 is an abundant number, since it is smaller than the sum of its proper divisors (44776272).

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

21841488 is a wasteful number, since it uses less digits than its factorization.

21841488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 911 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 21841488 is about 4673.4877768108. The cubic root of 21841488 is about 279.5293453699.

The spelling of 21841488 in words is "twenty-one million, eight hundred forty-one thousand, four hundred eighty-eight".