21044215604 has 12 divisors (see below), whose sum is σ = 37293547200. Its totient is φ = 10388916408.

The previous prime is 21044215597. The next prime is 21044215667. The reversal of 21044215604 is 40651244012.

It is a congruent number.

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, 33297494 + ... + 33298125.

It is an arithmetic number, because the mean of its divisors is an integer number (3107795600).

Almost surely, 2^21044215604 is an apocalyptic number.

It is an amenable number.

21044215604 is a deficient number, since it is larger than the sum of its proper divisors (16249331596).

21044215604 is a wasteful number, since it uses less digits than its factorization.

21044215604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66595702 (or 66595700 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21044215604 its reverse (40651244012), we get a palindrome (61695459616).

The spelling of 21044215604 in words is "twenty-one billion, forty-four million, two hundred fifteen thousand, six hundred four".