18212123 has 2 divisors, whose sum is σ = 18212124. Its totient is φ = 18212122.

The previous prime is 18212119. The next prime is 18212143. The reversal of 18212123 is 32121281.

It is an a-pointer prime, because the next prime (18212143) can be obtained adding 18212123 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18212123 - 2² = 18212119 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 18212095 and 18212104.

It is not a weakly prime, because it can be changed into another prime (18212143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106061 + 9106062.

It is an arithmetic number, because the mean of its divisors is an integer number (9106062).

Almost surely, 2^18212123 is an apocalyptic number.

18212123 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212123 is an equidigital number, since it uses as much as digits as its factorization.

18212123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 18212123 is about 4267.5664025297. The cubic root of 18212123 is about 263.0996022864.

The spelling of 18212123 in words is "eighteen million, two hundred twelve thousand, one hundred twenty-three".