21011102200 has 96 divisors (see below), whose sum is σ = 53891082000. Its totient is φ = 7554483200.

The previous prime is 21011102191. The next prime is 21011102219. The reversal of 21011102200 is 220111012.

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

It is a congruent number.

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, 142146 + ... + 249454.

Almost surely, 2^21011102200 is an apocalyptic number.

21011102200 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 21011102200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26945541000).

21011102200 is an abundant number, since it is smaller than the sum of its proper divisors (32879979800).

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

21011102200 is a wasteful number, since it uses less digits than its factorization.

21011102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107425 (or 107416 counting only the distinct ones).

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

Adding to 21011102200 its reverse (220111012), we get a palindrome (21231213212).

The spelling of 21011102200 in words is "twenty-one billion, eleven million, one hundred two thousand, two hundred".