218020123 has 2 divisors, whose sum is σ = 218020124. Its totient is φ = 218020122.

The previous prime is 218020109. The next prime is 218020133. The reversal of 218020123 is 321020812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218020123 - 2¹³ = 218011931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218020123.

It is not a weakly prime, because it can be changed into another prime (218020133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109010061 + 109010062.

It is an arithmetic number, because the mean of its divisors is an integer number (109010062).

Almost surely, 2^218020123 is an apocalyptic number.

218020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

218020123 is an equidigital number, since it uses as much as digits as its factorization.

218020123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 218020123 is about 14765.5044952755. The cubic root of 218020123 is about 601.8646831836.

Adding to 218020123 its reverse (321020812), we get a palindrome (539040935).

The spelling of 218020123 in words is "two hundred eighteen million, twenty thousand, one hundred twenty-three".