21110112212117 has 2 divisors, whose sum is σ = 21110112212118. Its totient is φ = 21110112212116.

The previous prime is 21110112212113. The next prime is 21110112212257. The reversal of 21110112212117 is 71121221101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10810062833956 + 10300049378161 = 3287866^2 + 3209369^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110112212117 - 2² = 21110112212113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110112212092 and 21110112212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110112212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555056106058 + 10555056106059.

It is an arithmetic number, because the mean of its divisors is an integer number (10555056106059).

Almost surely, 2^{21110112212117} is an apocalyptic number.

It is an amenable number.

21110112212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110112212117 is an equidigital number, since it uses as much as digits as its factorization.

21110112212117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 23.

Adding to 21110112212117 its reverse (71121221101112), we get a palindrome (92231333313229).

The spelling of 21110112212117 in words is "twenty-one trillion, one hundred ten billion, one hundred twelve million, two hundred twelve thousand, one hundred seventeen".