121200102120 has 64 divisors (see below), whose sum is σ = 369560989440. Its totient is φ = 31790188800.

The previous prime is 121200102109. The next prime is 121200102217. The reversal of 121200102120 is 21201002121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121200102096 and 121200102105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8271376 + ... + 8286015.

It is an arithmetic number, because the mean of its divisors is an integer number (5774390460).

Almost surely, 2^121200102120 is an apocalyptic number.

121200102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200102120 is an abundant number, since it is smaller than the sum of its proper divisors (248360887320).

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

121200102120 is a wasteful number, since it uses less digits than its factorization.

121200102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16557466 (or 16557462 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121200102120 its reverse (21201002121), we get a palindrome (142401104241).

Subtracting from 121200102120 its reverse (21201002121), we obtain a palindrome (99999099999).

The spelling of 121200102120 in words is "one hundred twenty-one billion, two hundred million, one hundred two thousand, one hundred twenty".