21101102200 has 48 divisors (see below), whose sum is σ = 49891617000. Its totient is φ = 8297377920.

The previous prime is 21101102173. The next prime is 21101102203. The reversal of 21101102200 is 220110112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101102203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 882315 + ... + 905914.

Almost surely, 2^21101102200 is an apocalyptic number.

21101102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101102200 is an abundant number, since it is smaller than the sum of its proper divisors (28790514800).

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

21101102200 is a wasteful number, since it uses less digits than its factorization.

21101102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788304 (or 1788295 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101102200 its reverse (220110112), we get a palindrome (21321212312).

The spelling of 21101102200 in words is "twenty-one billion, one hundred one million, one hundred two thousand, two hundred".