21013000123200 has 84 divisors (see below), whose sum is σ = 68940151253280. Its totient is φ = 5603466698240.

The previous prime is 21013000123169. The next prime is 21013000123201. The reversal of 21013000123200 is 232100031012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21013000123200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013000123201) 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, 2188849380 + ... + 2188858979.

Almost surely, 2^{21013000123200} is an apocalyptic number.

21013000123200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013000123200 is an abundant number, since it is smaller than the sum of its proper divisors (47927151130080).

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

21013000123200 is a wasteful number, since it uses less digits than its factorization.

21013000123200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377708384 (or 4377708369 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21013000123200 its reverse (232100031012), we get a palindrome (21245100154212).

The spelling of 21013000123200 in words is "twenty-one trillion, thirteen billion, one hundred twenty-three thousand, two hundred".