21200244211 has 4 divisors (see below), whose sum is σ = 21258010912. Its totient is φ = 21142477512.

The previous prime is 21200244209. The next prime is 21200244217. The reversal of 21200244211 is 11244200212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200244211 - 2¹ = 21200244209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200244217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28882800 + ... + 28883533.

It is an arithmetic number, because the mean of its divisors is an integer number (5314502728).

Almost surely, 2^21200244211 is an apocalyptic number.

21200244211 is a deficient number, since it is larger than the sum of its proper divisors (57766701).

21200244211 is an equidigital number, since it uses as much as digits as its factorization.

21200244211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57766700.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21200244211 its reverse (11244200212), we get a palindrome (32444444423).

The spelling of 21200244211 in words is "twenty-one billion, two hundred million, two hundred forty-four thousand, two hundred eleven".