21320256304 has 20 divisors (see below), whose sum is σ = 41356111720. Its totient is φ = 10647711360.

The previous prime is 21320256301. The next prime is 21320256313. The reversal of 21320256304 is 40365202312.

It is not an unprimeable number, because it can be changed into a prime (21320256301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761877 + ... + 789364.

It is an arithmetic number, because the mean of its divisors is an integer number (2067805586).

Almost surely, 2^21320256304 is an apocalyptic number.

It is an amenable number.

21320256304 is a deficient number, since it is larger than the sum of its proper divisors (20035855416).

21320256304 is a wasteful number, since it uses less digits than its factorization.

21320256304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552108 (or 1552102 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21320256304 its reverse (40365202312), we get a palindrome (61685458616).

The spelling of 21320256304 in words is "twenty-one billion, three hundred twenty million, two hundred fifty-six thousand, three hundred four".