21200011 has 8 divisors (see below), whose sum is σ = 24279264. Its totient is φ = 18133440.

The previous prime is 21199999. The next prime is 21200021. The reversal of 21200011 is 11000212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200011 - 2⁹ = 21199499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21199967 and 21200003.

It is not an unprimeable number, because it can be changed into a prime (21200021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741 + ... + 6553.

It is an arithmetic number, because the mean of its divisors is an integer number (3034908).

Almost surely, 2^21200011 is an apocalyptic number.

21200011 is a deficient number, since it is larger than the sum of its proper divisors (3079253).

21200011 is an equidigital number, since it uses as much as digits as its factorization.

21200011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21200011 is about 4604.3469678120. The cubic root of 21200011 is about 276.7655485971.

Adding to 21200011 its reverse (11000212), we get a palindrome (32200223).

The spelling of 21200011 in words is "twenty-one million, two hundred thousand, eleven".