21121100200200 has 1536 divisors, whose sum is σ = 89070539120640. Its totient is φ = 3998144102400.

The previous prime is 21121100200163. The next prime is 21121100200247. The reversal of 21121100200200 is 200200112112.

It is a super-2 number, since 2×21121100200200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 16209592749 + ... + 16209594051.

It is an arithmetic number, because the mean of its divisors is an integer number (57988632240).

Almost surely, 2^{21121100200200} is an apocalyptic number.

21121100200200 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 21121100200200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44535269560320).

21121100200200 is an abundant number, since it is smaller than the sum of its proper divisors (67949438920440).

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

21121100200200 is a wasteful number, since it uses less digits than its factorization.

21121100200200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121100200200 its reverse (200200112112), we get a palindrome (21321300312312).

The spelling of 21121100200200 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred thousand, two hundred".