21441002240 has 144 divisors (see below), whose sum is σ = 59658473280. Its totient is φ = 7230504960.

The previous prime is 21441002221. The next prime is 21441002267. The reversal of 21441002240 is 4220014412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526946 + ... + 566174.

Almost surely, 2^21441002240 is an apocalyptic number.

21441002240 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 21441002240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29829236640).

21441002240 is an abundant number, since it is smaller than the sum of its proper divisors (38217471040).

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

21441002240 is an equidigital number, since it uses as much as digits as its factorization.

21441002240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39318 (or 39304 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21441002240 its reverse (4220014412), we get a palindrome (25661016652).

The spelling of 21441002240 in words is "twenty-one billion, four hundred forty-one million, two thousand, two hundred forty".