21220020200 has 24 divisors (see below), whose sum is σ = 49336547430. Its totient is φ = 8488008000.

The previous prime is 21220020187. The next prime is 21220020223. The reversal of 21220020200 is 202002212.

It can be written as a sum of positive squares in 3 ways, for example, as 10994361316 + 10225658884 = 104854^2 + 101122^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53049851 + ... + 53050250.

Almost surely, 2^21220020200 is an apocalyptic number.

21220020200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220020200 is an abundant number, since it is smaller than the sum of its proper divisors (28116527230).

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

21220020200 is a wasteful number, since it uses less digits than its factorization.

21220020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106100117 (or 106100108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21220020200 its reverse (202002212), we get a palindrome (21422022412).

The spelling of 21220020200 in words is "twenty-one billion, two hundred twenty million, twenty thousand, two hundred".