21321201304 has 32 divisors (see below), whose sum is σ = 45584925120. Its totient is φ = 9261697536.

The previous prime is 21321201299. The next prime is 21321201311. The reversal of 21321201304 is 40310212312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6027984 + ... + 6031519.

It is an arithmetic number, because the mean of its divisors is an integer number (1424528910).

Almost surely, 2^21321201304 is an apocalyptic number.

It is an amenable number.

21321201304 is an abundant number, since it is smaller than the sum of its proper divisors (24263723816).

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

21321201304 is a wasteful number, since it uses less digits than its factorization.

21321201304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059539 (or 12059535 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21321201304 its reverse (40310212312), we get a palindrome (61631413616).

The spelling of 21321201304 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred four".