21030044240000 has 160 divisors (see below), whose sum is σ = 52364984825340. Its totient is φ = 8410088960000.

The previous prime is 21030044239999. The next prime is 21030044240039. The reversal of 21030044240000 is 4244003012.

It can be written as a sum of positive squares in 10 ways, for example, as 9443427336256 + 11586616903744 = 3073016^2 + 3403912^2 .

It is a tau number, because it is divible by the number of its divisors (160).

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 19 ways as a sum of consecutive naturals, for example, 378612230 + ... + 378667770.

Almost surely, 2^{21030044240000} is an apocalyptic number.

21030044240000 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 21030044240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26182492412670).

21030044240000 is an abundant number, since it is smaller than the sum of its proper divisors (31334940585340).

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

21030044240000 is an frugal number, since it uses more digits than its factorization.

21030044240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60308 (or 60281 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21030044240000 its reverse (4244003012), we get a palindrome (21034288243012).

The spelling of 21030044240000 in words is "twenty-one trillion, thirty billion, forty-four million, two hundred forty thousand".