21200403344 has 20 divisors (see below), whose sum is σ = 41595730560. Its totient is φ = 10466021280.

The previous prime is 21200403311. The next prime is 21200403379. The reversal of 21200403344 is 44330400212.

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 3 ways as a sum of consecutive naturals, for example, 8384972 + ... + 8387499.

It is an arithmetic number, because the mean of its divisors is an integer number (2079786528).

Almost surely, 2^21200403344 is an apocalyptic number.

It is an amenable number.

21200403344 is a deficient number, since it is larger than the sum of its proper divisors (20395327216).

21200403344 is a wasteful number, since it uses less digits than its factorization.

21200403344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16772558 (or 16772552 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21200403344 its reverse (44330400212), we get a palindrome (65530803556).

The spelling of 21200403344 in words is "twenty-one billion, two hundred million, four hundred three thousand, three hundred forty-four".