121221120123 has 12 divisors (see below), whose sum is σ = 175134945960. Its totient is φ = 80796646656.

The previous prime is 121221120121. The next prime is 121221120169. The reversal of 121221120123 is 321021122121.

It is not a de Polignac number, because 121221120123 - 2¹ = 121221120121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221120096 and 121221120105.

It is not an unprimeable number, because it can be changed into a prime (121221120121) 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 in 11 ways as a sum of consecutive naturals, for example, 1408678 + ... + 1492251.

It is an arithmetic number, because the mean of its divisors is an integer number (14594578830).

Almost surely, 2^121221120123 is an apocalyptic number.

121221120123 is a deficient number, since it is larger than the sum of its proper divisors (53913825837).

121221120123 is a wasteful number, since it uses less digits than its factorization.

121221120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905578 (or 2905575 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121221120123 its reverse (321021122121), we get a palindrome (442242242244).

The spelling of 121221120123 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-three".