21200211221312 has 28 divisors (see below), whose sum is σ = 42074221126980. Its totient is φ = 10598832669696.

The previous prime is 21200211221251. The next prime is 21200211221327. The reversal of 21200211221312 is 21312211200212.

It can be written as a sum of positive squares in 2 ways, for example, as 10609768765696 + 10590442455616 = 3257264^2 + 3254296^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19352483 + ... + 20418594.

It is an arithmetic number, because the mean of its divisors is an integer number (1502650754535).

Almost surely, 2^{21200211221312} is an apocalyptic number.

It is an amenable number.

21200211221312 is a deficient number, since it is larger than the sum of its proper divisors (20874009905668).

21200211221312 is an equidigital number, since it uses as much as digits as its factorization.

21200211221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39779418 (or 39779408 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21200211221312 its reverse (21312211200212), we get a palindrome (42512422421524).

The spelling of 21200211221312 in words is "twenty-one trillion, two hundred billion, two hundred eleven million, two hundred twenty-one thousand, three hundred twelve".