123121102120 has 32 divisors (see below), whose sum is σ = 280817314920. Its totient is φ = 48573803520.

The previous prime is 123121102109. The next prime is 123121102127. The reversal of 123121102120 is 21201121321.

It can be written as a sum of positive squares in 4 ways, for example, as 69056481796 + 54064620324 = 262786^2 + 232518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123121102094 and 123121102103.

It is not an unprimeable number, because it can be changed into a prime (123121102127) 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 7 ways as a sum of consecutive naturals, for example, 21079461 + ... + 21085300.

Almost surely, 2^123121102120 is an apocalyptic number.

123121102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121102120 is an abundant number, since it is smaller than the sum of its proper divisors (157696212800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123121102120 is a wasteful number, since it uses less digits than its factorization.

123121102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42164845 (or 42164841 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 123121102120 its reverse (21201121321), we get a palindrome (144322223441).

The spelling of 123121102120 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty".