21321210203312 has 20 divisors (see below), whose sum is σ = 41313086931600. Its totient is φ = 10659768414528.

The previous prime is 21321210203303. The next prime is 21321210203317. The reversal of 21321210203312 is 21330201212312.

It is not an unprimeable number, because it can be changed into a prime (21321210203317) 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, 52082687 + ... + 52490462.

It is an arithmetic number, because the mean of its divisors is an integer number (2065654346580).

Almost surely, 2^{21321210203312} is an apocalyptic number.

It is an amenable number.

21321210203312 is a deficient number, since it is larger than the sum of its proper divisors (19991876728288).

21321210203312 is a wasteful number, since it uses less digits than its factorization.

21321210203312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104585900 (or 104585894 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21321210203312 its reverse (21330201212312), we get a palindrome (42651411415624).

The spelling of 21321210203312 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred ten million, two hundred three thousand, three hundred twelve".