21022102200 has 192 divisors, whose sum is σ = 72827838720. Its totient is φ = 4971904000.

The previous prime is 21022102187. The next prime is 21022102201. The reversal of 21022102200 is 220122012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022102201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 231757 + ... + 309443.

It is an arithmetic number, because the mean of its divisors is an integer number (379311660).

Almost surely, 2^21022102200 is an apocalyptic number.

21022102200 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 21022102200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36413919360).

21022102200 is an abundant number, since it is smaller than the sum of its proper divisors (51805736520).

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

21022102200 is a wasteful number, since it uses less digits than its factorization.

21022102200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77758 (or 77749 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21022102200 its reverse (220122012), we get a palindrome (21242224212).

The spelling of 21022102200 in words is "twenty-one billion, twenty-two million, one hundred two thousand, two hundred".