21220320200 has 96 divisors (see below), whose sum is σ = 50392756800. Its totient is φ = 8307336960.

The previous prime is 21220320157. The next prime is 21220320211. The reversal of 21220320200 is 202302212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4693541 + ... + 4698059.

It is an arithmetic number, because the mean of its divisors is an integer number (524924550).

Almost surely, 2^21220320200 is an apocalyptic number.

21220320200 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 21220320200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25196378400).

21220320200 is an abundant number, since it is smaller than the sum of its proper divisors (29172436600).

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

21220320200 is a wasteful number, since it uses less digits than its factorization.

21220320200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5031 (or 5022 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21220320200 its reverse (202302212), we get a palindrome (21422622412).

The spelling of 21220320200 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, two hundred".