21022021020911 has 2 divisors, whose sum is σ = 21022021020912. Its totient is φ = 21022021020910.

The previous prime is 21022021020863. The next prime is 21022021020937. The reversal of 21022021020911 is 11902012022012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022021020911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022021020941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511010510455 + 10511010510456.

It is an arithmetic number, because the mean of its divisors is an integer number (10511010510456).

Almost surely, 2^{21022021020911} is an apocalyptic number.

21022021020911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022021020911 is an equidigital number, since it uses as much as digits as its factorization.

21022021020911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 21022021020911 its reverse (11902012022012), we get a palindrome (32924033042923).

The spelling of 21022021020911 in words is "twenty-one trillion, twenty-two billion, twenty-one million, twenty thousand, nine hundred eleven".