121000002100120 has 128 divisors (see below), whose sum is σ = 338660639634240. Its totient is φ = 38226244976640.

The previous prime is 121000002100099. The next prime is 121000002100127. The reversal of 121000002100120 is 21001200000121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121000002100097 and 121000002100106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000002100127) 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 31 ways as a sum of consecutive naturals, for example, 622074717 + ... + 622269196.

Almost surely, 2^{121000002100120} is an apocalyptic number.

121000002100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121000002100120 is an abundant number, since it is smaller than the sum of its proper divisors (217660637534120).

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

121000002100120 is a wasteful number, since it uses less digits than its factorization.

121000002100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244343965 (or 1244343961 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121000002100120 its reverse (21001200000121), we get a palindrome (142001202100241).

The spelling of 121000002100120 in words is "one hundred twenty-one trillion, two million, one hundred thousand, one hundred twenty".