21211121200200 has 96 divisors (see below), whose sum is σ = 66121819495200. Its totient is φ = 5624699522560.

The previous prime is 21211121200183. The next prime is 21211121200273. The reversal of 21211121200200 is 200212111212.

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 21211121200200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98640837 + ... + 98855636.

It is an arithmetic number, because the mean of its divisors is an integer number (688768953075).

Almost surely, 2^{21211121200200} is an apocalyptic number.

21211121200200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211121200200 is an abundant number, since it is smaller than the sum of its proper divisors (44910698295000).

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

21211121200200 is a wasteful number, since it uses less digits than its factorization.

21211121200200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197496671 (or 197496662 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211121200200 its reverse (200212111212), we get a palindrome (21411333311412).

The spelling of 21211121200200 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred thousand, two hundred".