121200002120 has 32 divisors (see below), whose sum is σ = 287052638400. Its totient is φ = 45928421568.

The previous prime is 121200002111. The next prime is 121200002137. The reversal of 121200002120 is 21200002121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79736084 + ... + 79737603.

It is an arithmetic number, because the mean of its divisors is an integer number (8970394950).

Almost surely, 2^121200002120 is an apocalyptic number.

121200002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200002120 is an abundant number, since it is smaller than the sum of its proper divisors (165852636280).

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

121200002120 is a wasteful number, since it uses less digits than its factorization.

121200002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159473717 (or 159473713 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121200002120 its reverse (21200002121), we get a palindrome (142400004241).

Subtracting from 121200002120 its reverse (21200002121), we obtain a palindrome (99999999999).

The spelling of 121200002120 in words is "one hundred twenty-one billion, two hundred million, two thousand, one hundred twenty".