21321312202321 has 16 divisors (see below), whose sum is σ = 22806041472000. Its totient is φ = 19888767662400.

The previous prime is 21321312202297. The next prime is 21321312202381. The reversal of 21321312202321 is 12320221312312.

It is not a de Polignac number, because 21321312202321 - 2¹¹ = 21321312200273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321312202381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19258410 + ... + 20335411.

It is an arithmetic number, because the mean of its divisors is an integer number (1425377592000).

Almost surely, 2^{21321312202321} is an apocalyptic number.

It is an amenable number.

21321312202321 is a deficient number, since it is larger than the sum of its proper divisors (1484729269679).

21321312202321 is a wasteful number, since it uses less digits than its factorization.

21321312202321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39594480.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21321312202321 its reverse (12320221312312), we get a palindrome (33641533514633).

The spelling of 21321312202321 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twelve million, two hundred two thousand, three hundred twenty-one".