21131313212200 has 48 divisors (see below), whose sum is σ = 49139127913500. Its totient is φ = 8451007057920.

The previous prime is 21131313212197. The next prime is 21131313212209. The reversal of 21131313212200 is 221231313112.

It can be written as a sum of positive squares in 6 ways, for example, as 7318182785796 + 13813130426404 = 2705214^2 + 3716602^2 .

It is not an unprimeable number, because it can be changed into a prime (21131313212209) 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 11 ways as a sum of consecutive naturals, for example, 8372335 + ... + 10599934.

Almost surely, 2^{21131313212200} is an apocalyptic number.

21131313212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131313212200 is an abundant number, since it is smaller than the sum of its proper divisors (28007814701300).

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

21131313212200 is a wasteful number, since it uses less digits than its factorization.

21131313212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18977854 (or 18977845 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21131313212200 its reverse (221231313112), we get a palindrome (21352544525312).

The spelling of 21131313212200 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred thirteen million, two hundred twelve thousand, two hundred".