21222222200 has 24 divisors (see below), whose sum is σ = 49341667080. Its totient is φ = 8488888800.

The previous prime is 21222222181. The next prime is 21222222209. The reversal of 21222222200 is 222222212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222222209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53055356 + ... + 53055755.

It is an arithmetic number, because the mean of its divisors is an integer number (2055902795).

Almost surely, 2^21222222200 is an apocalyptic number.

21222222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222222200 is an abundant number, since it is smaller than the sum of its proper divisors (28119444880).

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

21222222200 is a wasteful number, since it uses less digits than its factorization.

21222222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106111127 (or 106111118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21222222200 its reverse (222222212), we get a palindrome (21444444412).

The spelling of 21222222200 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred".