21010211122111 has 2 divisors, whose sum is σ = 21010211122112. Its totient is φ = 21010211122110.

The previous prime is 21010211122081. The next prime is 21010211122123. The reversal of 21010211122111 is 11122111201012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010211122111 - 2²³ = 21010202733503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010211122141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505105561055 + 10505105561056.

It is an arithmetic number, because the mean of its divisors is an integer number (10505105561056).

Almost surely, 2^{21010211122111} is an apocalyptic number.

21010211122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010211122111 is an equidigital number, since it uses as much as digits as its factorization.

21010211122111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21010211122111 its reverse (11122111201012), we get a palindrome (32132322323123).

The spelling of 21010211122111 in words is "twenty-one trillion, ten billion, two hundred eleven million, one hundred twenty-two thousand, one hundred eleven".