21011320304 has 20 divisors (see below), whose sum is σ = 43840928376. Its totient is φ = 9697532352.

The previous prime is 21011320301. The next prime is 21011320313. The reversal of 21011320304 is 40302311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011320301) 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 in 3 ways as a sum of consecutive naturals, for example, 50507774 + ... + 50508189.

Almost surely, 2^21011320304 is an apocalyptic number.

It is an amenable number.

21011320304 is an abundant number, since it is smaller than the sum of its proper divisors (22829608072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011320304 is a wasteful number, since it uses less digits than its factorization.

21011320304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101015984 (or 101015978 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21011320304 its reverse (40302311012), we get a palindrome (61313631316).

The spelling of 21011320304 in words is "twenty-one billion, eleven million, three hundred twenty thousand, three hundred four".