21444041000 has 128 divisors (see below), whose sum is σ = 50779872000. Its totient is φ = 8475667200.

The previous prime is 21444040999. The next prime is 21444041033. The reversal of 21444041000 is 14044412.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 39202727 + ... + 39203273.

It is an arithmetic number, because the mean of its divisors is an integer number (396717750).

Almost surely, 2^21444041000 is an apocalyptic number.

21444041000 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 21444041000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25389936000).

21444041000 is an abundant number, since it is smaller than the sum of its proper divisors (29335831000).

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

21444041000 is a wasteful number, since it uses less digits than its factorization.

21444041000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 950 counting only the distinct ones).

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

Adding to 21444041000 its reverse (14044412), we get a palindrome (21458085412).

The spelling of 21444041000 in words is "twenty-one billion, four hundred forty-four million, forty-one thousand".