21113330564 has 6 divisors (see below), whose sum is σ = 36948328494. Its totient is φ = 10556665280.

The previous prime is 21113330561. The next prime is 21113330597. The reversal of 21113330564 is 46503331112.

It can be written as a sum of positive squares in only one way, i.e., 19154560000 + 1958770564 = 138400^2 + 44258^2 .

It is not an unprimeable number, because it can be changed into a prime (21113330561) by changing a digit.

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 as a sum of consecutive naturals, namely, 2639166317 + ... + 2639166324.

It is an arithmetic number, because the mean of its divisors is an integer number (6158054749).

Almost surely, 2^21113330564 is an apocalyptic number.

It is an amenable number.

21113330564 is a deficient number, since it is larger than the sum of its proper divisors (15834997930).

21113330564 is a wasteful number, since it uses less digits than its factorization.

21113330564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278332645 (or 5278332643 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 21113330564 its reverse (46503331112), we get a palindrome (67616661676).

The spelling of 21113330564 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty thousand, five hundred sixty-four".