20123103211 has 2 divisors, whose sum is σ = 20123103212. Its totient is φ = 20123103210.

The previous prime is 20123103197. The next prime is 20123103239. The reversal of 20123103211 is 11230132102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123103211 - 2⁷ = 20123103083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123103911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061551605 + 10061551606.

It is an arithmetic number, because the mean of its divisors is an integer number (10061551606).

Almost surely, 2^20123103211 is an apocalyptic number.

20123103211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123103211 is an equidigital number, since it uses as much as digits as its factorization.

20123103211 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 16.

Adding to 20123103211 its reverse (11230132102), we get a palindrome (31353235313).

The spelling of 20123103211 in words is "twenty billion, one hundred twenty-three million, one hundred three thousand, two hundred eleven".