121212020123 has 2 divisors, whose sum is σ = 121212020124. Its totient is φ = 121212020122.

The previous prime is 121212020081. The next prime is 121212020173. The reversal of 121212020123 is 321020212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121212020123 - 2¹⁰ = 121212019099 is a prime.

It is not a weakly prime, because it can be changed into another prime (121212020173) 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, 60606010061 + 60606010062.

It is an arithmetic number, because the mean of its divisors is an integer number (60606010062).

Almost surely, 2^121212020123 is an apocalyptic number.

121212020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212020123 is an equidigital number, since it uses as much as digits as its factorization.

121212020123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121212020123 its reverse (321020212121), we get a palindrome (442232232244).

The spelling of 121212020123 in words is "one hundred twenty-one billion, two hundred twelve million, twenty thousand, one hundred twenty-three".