21210720110011 has 2 divisors, whose sum is σ = 21210720110012. Its totient is φ = 21210720110010.

The previous prime is 21210720109937. The next prime is 21210720110039. The reversal of 21210720110011 is 11001102701212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210720110011 - 2⁹ = 21210720109499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210720110051) 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 as a sum of consecutive naturals, namely, 10605360055005 + 10605360055006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605360055006).

Almost surely, 2^{21210720110011} is an apocalyptic number.

21210720110011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210720110011 is an equidigital number, since it uses as much as digits as its factorization.

21210720110011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 21210720110011 its reverse (11001102701212), we get a palindrome (32211822811223).

The spelling of 21210720110011 in words is "twenty-one trillion, two hundred ten billion, seven hundred twenty million, one hundred ten thousand, eleven".