121002100120 has 32 divisors (see below), whose sum is σ = 297005155920. Its totient is φ = 44000763520.

The previous prime is 121002100103. The next prime is 121002100139. The reversal of 121002100120 is 21001200121.

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 = 121002100097 and 121002100106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137501947 + ... + 137502826.

Almost surely, 2^121002100120 is an apocalyptic number.

121002100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002100120 is an abundant number, since it is smaller than the sum of its proper divisors (176003055800).

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

121002100120 is a wasteful number, since it uses less digits than its factorization.

121002100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275004795 (or 275004791 counting only the distinct ones).

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

Adding to 121002100120 its reverse (21001200121), we get a palindrome (142003300241).

It can be divided in two parts, 121002 and 100120, that added together give a palindrome (221122).

The spelling of 121002100120 in words is "one hundred twenty-one billion, two million, one hundred thousand, one hundred twenty".