21100002200111 has 2 divisors, whose sum is σ = 21100002200112. Its totient is φ = 21100002200110.

The previous prime is 21100002200087. The next prime is 21100002200143. The reversal of 21100002200111 is 11100220000112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100002200111 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100002200092 and 21100002200101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100002200311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550001100055 + 10550001100056.

It is an arithmetic number, because the mean of its divisors is an integer number (10550001100056).

Almost surely, 2^{21100002200111} is an apocalyptic number.

21100002200111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100002200111 is an equidigital number, since it uses as much as digits as its factorization.

21100002200111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100002200111 its reverse (11100220000112), we get a palindrome (32200222200223).

The spelling of 21100002200111 in words is "twenty-one trillion, one hundred billion, two million, two hundred thousand, one hundred eleven".