21044244330 has 24 divisors (see below), whose sum is σ = 54715035492. Its totient is φ = 5611798464.

The previous prime is 21044244329. The next prime is 21044244337. The reversal of 21044244330 is 3344244012.

It is a happy number.

21044244330 is a `hidden beast` number, since 210 + 4 + 4 + 2 + 443 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20440706841 + 603537489 = 142971^2 + 24567^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21044244294 and 21044244303.

It is not an unprimeable number, because it can be changed into a prime (21044244337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116912379 + ... + 116912558.

Almost surely, 2^21044244330 is an apocalyptic number.

21044244330 is an abundant number, since it is smaller than the sum of its proper divisors (33670791162).

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

21044244330 is a wasteful number, since it uses less digits than its factorization.

21044244330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233824950 (or 233824947 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21044244330 its reverse (3344244012), we get a palindrome (24388488342).

The spelling of 21044244330 in words is "twenty-one billion, forty-four million, two hundred forty-four thousand, three hundred thirty".