21200202011 has 4 divisors (see below), whose sum is σ = 21204669024. Its totient is φ = 21195735000.

The previous prime is 21200201989. The next prime is 21200202017. The reversal of 21200202011 is 11020200212.

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 21200202011 - 2³⁰ = 20126460187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200201983 and 21200202001.

It is not an unprimeable number, because it can be changed into a prime (21200202017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2226380 + ... + 2235881.

It is an arithmetic number, because the mean of its divisors is an integer number (5301167256).

Almost surely, 2^21200202011 is an apocalyptic number.

21200202011 is a deficient number, since it is larger than the sum of its proper divisors (4467013).

21200202011 is an equidigital number, since it uses as much as digits as its factorization.

21200202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4467012.

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

Adding to 21200202011 its reverse (11020200212), we get a palindrome (32220402223).

The spelling of 21200202011 in words is "twenty-one billion, two hundred million, two hundred two thousand, eleven".