121011661660123 has 48 divisors (see below), whose sum is σ = 138591328512000. Its totient is φ = 105319115875584.

The previous prime is 121011661660121. The next prime is 121011661660189. The reversal of 121011661660123 is 321066166110121.

It is a happy number.

It is not a de Polignac number, because 121011661660123 - 2¹ = 121011661660121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121011661660121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2698781338 + ... + 2698826176.

It is an arithmetic number, because the mean of its divisors is an integer number (2887319344000).

Almost surely, 2^{121011661660123} is an apocalyptic number.

121011661660123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121011661660123 is a deficient number, since it is larger than the sum of its proper divisors (17579666851877).

121011661660123 is a wasteful number, since it uses less digits than its factorization.

121011661660123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48876 (or 48863 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 121011661660123 in words is "one hundred twenty-one trillion, eleven billion, six hundred sixty-one million, six hundred sixty thousand, one hundred twenty-three".