21222012200 has 24 divisors (see below), whose sum is σ = 49341178830. Its totient is φ = 8488804800.

The previous prime is 21222012197. The next prime is 21222012221. The reversal of 21222012200 is 221022212.

It can be written as a sum of positive squares in 3 ways, for example, as 19066638724 + 2155373476 = 138082^2 + 46426^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 53054831 + ... + 53055230.

Almost surely, 2^21222012200 is an apocalyptic number.

21222012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222012200 is an abundant number, since it is smaller than the sum of its proper divisors (28119166630).

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

21222012200 is a wasteful number, since it uses less digits than its factorization.

21222012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106110077 (or 106110068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21222012200 its reverse (221022212), we get a palindrome (21443034412).

It can be divided in two parts, 21222012 and 200, that added together give a palindrome (21222212).

The spelling of 21222012200 in words is "twenty-one billion, two hundred twenty-two million, twelve thousand, two hundred".