21202002011 has 2 divisors, whose sum is σ = 21202002012. Its totient is φ = 21202002010.

The previous prime is 21202002007. The next prime is 21202002049. The reversal of 21202002011 is 11020020212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202002011 - 2² = 21202002007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202001983 and 21202002001.

It is not a weakly prime, because it can be changed into another prime (21202002001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601001005 + 10601001006.

It is an arithmetic number, because the mean of its divisors is an integer number (10601001006).

Almost surely, 2^21202002011 is an apocalyptic number.

21202002011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202002011 is an equidigital number, since it uses as much as digits as its factorization.

21202002011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21202002011 its reverse (11020020212), we get a palindrome (32222022223).

The spelling of 21202002011 in words is "twenty-one billion, two hundred two million, two thousand, eleven".