21200220011 has 4 divisors (see below), whose sum is σ = 21211577112. Its totient is φ = 21188862912.

The previous prime is 21200219987. The next prime is 21200220049. The reversal of 21200220011 is 11002200212.

It is a happy number.

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 21200220011 - 2¹⁴ = 21200203627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200219974 and 21200220001.

It is not an unprimeable number, because it can be changed into a prime (21200250011) 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, 5675750 + ... + 5679483.

It is an arithmetic number, because the mean of its divisors is an integer number (5302894278).

Almost surely, 2^21200220011 is an apocalyptic number.

21200220011 is a deficient number, since it is larger than the sum of its proper divisors (11357101).

21200220011 is a wasteful number, since it uses less digits than its factorization.

21200220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11357100.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200220011 its reverse (11002200212), we get a palindrome (32202420223).

The spelling of 21200220011 in words is "twenty-one billion, two hundred million, two hundred twenty thousand, eleven".