210123203111 has 2 divisors, whose sum is σ = 210123203112. Its totient is φ = 210123203110.

The previous prime is 210123203063. The next prime is 210123203153. The reversal of 210123203111 is 111302321012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210123203111 - 2⁶ = 210123203047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210123203111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210123203911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061601555 + 105061601556.

It is an arithmetic number, because the mean of its divisors is an integer number (105061601556).

Almost surely, 2^210123203111 is an apocalyptic number.

210123203111 is a deficient number, since it is larger than the sum of its proper divisors (1).

210123203111 is an equidigital number, since it uses as much as digits as its factorization.

210123203111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 210123203111 its reverse (111302321012), we get a palindrome (321425524123).

The spelling of 210123203111 in words is "two hundred ten billion, one hundred twenty-three million, two hundred three thousand, one hundred eleven".