121201110123 has 16 divisors (see below), whose sum is σ = 166083533856. Its totient is φ = 78562725120.

The previous prime is 121201110089. The next prime is 121201110259. The reversal of 121201110123 is 321011102121.

It is not a de Polignac number, because 121201110123 - 2¹⁸ = 121200847979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121201111123) 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 in 15 ways as a sum of consecutive naturals, for example, 214458 + ... + 537023.

It is an arithmetic number, because the mean of its divisors is an integer number (10380220866).

Almost surely, 2^121201110123 is an apocalyptic number.

121201110123 is a deficient number, since it is larger than the sum of its proper divisors (44882423733).

121201110123 is a wasteful number, since it uses less digits than its factorization.

121201110123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752974.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 121201110123 its reverse (321011102121), we get a palindrome (442212212244).

The spelling of 121201110123 in words is "one hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred twenty-three".