21220312304 has 40 divisors (see below), whose sum is σ = 41387946240. Its totient is φ = 10539764928.

The previous prime is 21220312301. The next prime is 21220312319. The reversal of 21220312304 is 40321302212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220312301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675307 + ... + 1687925.

It is an arithmetic number, because the mean of its divisors is an integer number (1034698656).

Almost surely, 2^21220312304 is an apocalyptic number.

It is an amenable number.

21220312304 is a deficient number, since it is larger than the sum of its proper divisors (20167633936).

21220312304 is a wasteful number, since it uses less digits than its factorization.

21220312304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13317 (or 13311 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21220312304 its reverse (40321302212), we get a palindrome (61541614516).

The spelling of 21220312304 in words is "twenty-one billion, two hundred twenty million, three hundred twelve thousand, three hundred four".