21303332564 has 6 divisors (see below), whose sum is σ = 37280831994. Its totient is φ = 10651666280.

The previous prime is 21303332521. The next prime is 21303332569. The reversal of 21303332564 is 46523330312.

It can be written as a sum of positive squares in only one way, i.e., 15836208964 + 5467123600 = 125842^2 + 73940^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21303332564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303332569) 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, 2662916567 + ... + 2662916574.

It is an arithmetic number, because the mean of its divisors is an integer number (6213471999).

Almost surely, 2^21303332564 is an apocalyptic number.

It is an amenable number.

21303332564 is a deficient number, since it is larger than the sum of its proper divisors (15977499430).

21303332564 is a wasteful number, since it uses less digits than its factorization.

21303332564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325833145 (or 5325833143 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 32.

Adding to 21303332564 its reverse (46523330312), we get a palindrome (67826662876).

The spelling of 21303332564 in words is "twenty-one billion, three hundred three million, three hundred thirty-two thousand, five hundred sixty-four".