20110217123 has 2 divisors, whose sum is σ = 20110217124. Its totient is φ = 20110217122.

The previous prime is 20110217107. The next prime is 20110217143. The reversal of 20110217123 is 32171201102.

It is an a-pointer prime, because the next prime (20110217143) can be obtained adding 20110217123 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20110217123 - 2⁴ = 20110217107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110217095 and 20110217104.

It is not a weakly prime, because it can be changed into another prime (20110217143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055108561 + 10055108562.

It is an arithmetic number, because the mean of its divisors is an integer number (10055108562).

Almost surely, 2^20110217123 is an apocalyptic number.

20110217123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110217123 is an equidigital number, since it uses as much as digits as its factorization.

20110217123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 20110217123 its reverse (32171201102), we get a palindrome (52281418225).

The spelling of 20110217123 in words is "twenty billion, one hundred ten million, two hundred seventeen thousand, one hundred twenty-three".