21012110002111 has 2 divisors, whose sum is σ = 21012110002112. Its totient is φ = 21012110002110.

The previous prime is 21012110002069. The next prime is 21012110002129. The reversal of 21012110002111 is 11120001121012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012110002111 - 2⁷ = 21012110001983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012110002091 and 21012110002100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012110002171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506055001055 + 10506055001056.

It is an arithmetic number, because the mean of its divisors is an integer number (10506055001056).

Almost surely, 2^{21012110002111} is an apocalyptic number.

21012110002111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012110002111 is an equidigital number, since it uses as much as digits as its factorization.

21012110002111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012110002111 its reverse (11120001121012), we get a palindrome (32132111123123).

The spelling of 21012110002111 in words is "twenty-one trillion, twelve billion, one hundred ten million, two thousand, one hundred eleven".