1200002120121 has 32 divisors (see below), whose sum is σ = 1899096779520. Its totient is φ = 659686173696.

The previous prime is 1200002120117. The next prime is 1200002120183. The reversal of 1200002120121 is 1210212000021.

It is not a de Polignac number, because 1200002120121 - 2² = 1200002120117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200002120097 and 1200002120106.

It is not an unprimeable number, because it can be changed into a prime (1200002120521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8607276 + ... + 8745581.

It is an arithmetic number, because the mean of its divisors is an integer number (59346774360).

Almost surely, 2^{1200002120121} is an apocalyptic number.

It is an amenable number.

1200002120121 is a deficient number, since it is larger than the sum of its proper divisors (699094659399).

1200002120121 is a wasteful number, since it uses less digits than its factorization.

1200002120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17352993.

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

Adding to 1200002120121 its reverse (1210212000021), we get a palindrome (2410214120142).

The spelling of 1200002120121 in words is "one trillion, two hundred billion, two million, one hundred twenty thousand, one hundred twenty-one".