21222122200 has 96 divisors (see below), whose sum is σ = 52918822800. Its totient is φ = 7890255360.

The previous prime is 21222122191. The next prime is 21222122209. The reversal of 21222122200 is 222122212.

It is an interprime number because it is at equal distance from previous prime (21222122191) and next prime (21222122209).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222122209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148714 + ... + 254086.

Almost surely, 2^21222122200 is an apocalyptic number.

21222122200 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 21222122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26459411400).

21222122200 is an abundant number, since it is smaller than the sum of its proper divisors (31696700600).

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

21222122200 is a wasteful number, since it uses less digits than its factorization.

21222122200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105461 (or 105452 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222122200 its reverse (222122212), we get a palindrome (21444244412).

The spelling of 21222122200 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred".