21202122202111 has 2 divisors, whose sum is σ = 21202122202112. Its totient is φ = 21202122202110.

The previous prime is 21202122201979. The next prime is 21202122202141. The reversal of 21202122202111 is 11120222120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202122202111 - 2¹⁹ = 21202121677823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202122202141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601061101055 + 10601061101056.

It is an arithmetic number, because the mean of its divisors is an integer number (10601061101056).

Almost surely, 2^{21202122202111} is an apocalyptic number.

21202122202111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202122202111 is an equidigital number, since it uses as much as digits as its factorization.

21202122202111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21202122202111 its reverse (11120222120212), we get a palindrome (32322344322323).

The spelling of 21202122202111 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, two hundred two thousand, one hundred eleven".