21000111100200 has 96 divisors (see below), whose sum is σ = 72333716030400. Its totient is φ = 5600029625280.

The previous prime is 21000111100183. The next prime is 21000111100271. The reversal of 21000111100200 is 200111100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 1944449332 + ... + 1944460131.

It is an arithmetic number, because the mean of its divisors is an integer number (753476208650).

Almost surely, 2^{21000111100200} is an apocalyptic number.

21000111100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000111100200 is an abundant number, since it is smaller than the sum of its proper divisors (51333604930200).

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

21000111100200 is a wasteful number, since it uses less digits than its factorization.

21000111100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888909488 (or 3888909473 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21000111100200 its reverse (200111100012), we get a palindrome (21200222200212).

The spelling of 21000111100200 in words is "twenty-one trillion, one hundred eleven million, one hundred thousand, two hundred".