21121032001200 has 240 divisors, whose sum is σ = 70128546009600. Its totient is φ = 5430163368960.

The previous prime is 21121032001177. The next prime is 21121032001213. The reversal of 21121032001200 is 210023012112.

It is a tau number, because it is divible by the number of its divisors (240).

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 21121032001200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 984126 + ... + 6573474.

It is an arithmetic number, because the mean of its divisors is an integer number (292202275040).

Almost surely, 2^{21121032001200} is an apocalyptic number.

21121032001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121032001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35064273004800).

21121032001200 is an abundant number, since it is smaller than the sum of its proper divisors (49007514008400).

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

21121032001200 is a wasteful number, since it uses less digits than its factorization.

21121032001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589484 (or 5589473 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121032001200 its reverse (210023012112), we get a palindrome (21331055013312).

The spelling of 21121032001200 in words is "twenty-one trillion, one hundred twenty-one billion, thirty-two million, one thousand, two hundred".