21031444330 has 16 divisors (see below), whose sum is σ = 40768646184. Its totient is φ = 7765456320.

The previous prime is 21031444309. The next prime is 21031444349. The reversal of 21031444330 is 3344413012.

It can be written as a sum of positive squares in 4 ways, for example, as 15308370529 + 5723073801 = 123727^2 + 75651^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21031444295 and 21031444304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80890041 + ... + 80890300.

Almost surely, 2^21031444330 is an apocalyptic number.

21031444330 is a deficient number, since it is larger than the sum of its proper divisors (19737201854).

21031444330 is a wasteful number, since it uses less digits than its factorization.

21031444330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161780361.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21031444330 its reverse (3344413012), we get a palindrome (24375857342).

The spelling of 21031444330 in words is "twenty-one billion, thirty-one million, four hundred forty-four thousand, three hundred thirty".