13121235200 has 54 divisors (see below), whose sum is σ = 32477123154. Its totient is φ = 5248491520.

The previous prime is 13121235187. The next prime is 13121235221. The reversal of 13121235200 is 253212131.

It can be written as a sum of positive squares in 3 ways, for example, as 55830784 + 13065404416 = 7472^2 + 114304^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1018697 + ... + 1031496.

Almost surely, 2^13121235200 is an apocalyptic number.

13121235200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121235200 is an abundant number, since it is smaller than the sum of its proper divisors (19355887954).

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

13121235200 is an equidigital number, since it uses as much as digits as its factorization.

13121235200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050219 (or 2050200 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 13121235200 its reverse (253212131), we get a palindrome (13374447331).

The spelling of 13121235200 in words is "thirteen billion, one hundred twenty-one million, two hundred thirty-five thousand, two hundred".