21444244000 has 48 divisors (see below), whose sum is σ = 52688517336. Its totient is φ = 8577696000.

The previous prime is 21444243979. The next prime is 21444244009. The reversal of 21444244000 is 44244412.

It can be written as a sum of positive squares in 4 ways, for example, as 7142954256 + 14301289744 = 84516^2 + 119588^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21444244009) 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, 2676531 + ... + 2684530.

Almost surely, 2^21444244000 is an apocalyptic number.

21444244000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444244000 is an abundant number, since it is smaller than the sum of its proper divisors (31244273336).

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

21444244000 is an equidigital number, since it uses as much as digits as its factorization.

21444244000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361086 (or 5361068 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21444244000 its reverse (44244412), we get a palindrome (21488488412).

The spelling of 21444244000 in words is "twenty-one billion, four hundred forty-four million, two hundred forty-four thousand".