21323120236 has 12 divisors (see below), whose sum is σ = 40707775080. Its totient is φ = 9692327360.

The previous prime is 21323120183. The next prime is 21323120237. The reversal of 21323120236 is 63202132312.

It is a self number, because there is not a number n which added to its sum of digits gives 21323120236.

It is not an unprimeable number, because it can be changed into a prime (21323120237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242308141 + ... + 242308228.

It is an arithmetic number, because the mean of its divisors is an integer number (3392314590).

Almost surely, 2^21323120236 is an apocalyptic number.

It is an amenable number.

21323120236 is a deficient number, since it is larger than the sum of its proper divisors (19384654844).

21323120236 is a wasteful number, since it uses less digits than its factorization.

21323120236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484616384 (or 484616382 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21323120236 its reverse (63202132312), we get a palindrome (84525252548).

The spelling of 21323120236 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, two hundred thirty-six".