21011320013011 has 2 divisors, whose sum is σ = 21011320013012. Its totient is φ = 21011320013010.

The previous prime is 21011320013009. The next prime is 21011320013017. The reversal of 21011320013011 is 11031002311012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011320013011 - 2¹ = 21011320013009 is a prime.

It is a super-2 number, since 2×21011320013011² (a number of 27 digits) contains 22 as substring.

Together with 21011320013009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21011320013017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505660006505 + 10505660006506.

It is an arithmetic number, because the mean of its divisors is an integer number (10505660006506).

Almost surely, 2^{21011320013011} is an apocalyptic number.

21011320013011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011320013011 is an equidigital number, since it uses as much as digits as its factorization.

21011320013011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21011320013011 its reverse (11031002311012), we get a palindrome (32042322324023).

The spelling of 21011320013011 in words is "twenty-one trillion, eleven billion, three hundred twenty million, thirteen thousand, eleven".