21044023306 has 16 divisors (see below), whose sum is σ = 33532250400. Its totient is φ = 9876768048.

The previous prime is 21044023303. The next prime is 21044023307. The reversal of 21044023306 is 60332044012.

It is not an unprimeable number, because it can be changed into a prime (21044023303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2536180 + ... + 2544463.

It is an arithmetic number, because the mean of its divisors is an integer number (2095765650).

Almost surely, 2^21044023306 is an apocalyptic number.

21044023306 is a deficient number, since it is larger than the sum of its proper divisors (12488227094).

21044023306 is a wasteful number, since it uses less digits than its factorization.

21044023306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080773.

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

Adding to 21044023306 its reverse (60332044012), we get a palindrome (81376067318).

The spelling of 21044023306 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred six".