21001120222111 has 2 divisors, whose sum is σ = 21001120222112. Its totient is φ = 21001120222110.

The previous prime is 21001120222063. The next prime is 21001120222193. The reversal of 21001120222111 is 11122202110012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001120222111 - 2²⁹ = 21000583351199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001120222211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560111055 + 10500560111056.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560111056).

Almost surely, 2^{21001120222111} is an apocalyptic number.

21001120222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120222111 is an equidigital number, since it uses as much as digits as its factorization.

21001120222111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001120222111 its reverse (11122202110012), we get a palindrome (32123322332123).

The spelling of 21001120222111 in words is "twenty-one trillion, one billion, one hundred twenty million, two hundred twenty-two thousand, one hundred eleven".