1200200000121 has 24 divisors (see below), whose sum is σ = 1824934879040. Its totient is φ = 757992232800.

The previous prime is 1200200000099. The next prime is 1200200000149. The reversal of 1200200000121 is 1210000020021.

It is not a de Polignac number, because 1200200000121 - 2¹⁴ = 1200199983737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1200200000821) 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 23 ways as a sum of consecutive naturals, for example, 4939716 + ... + 5176986.

Almost surely, 2^{1200200000121} is an apocalyptic number.

It is an amenable number.

1200200000121 is a deficient number, since it is larger than the sum of its proper divisors (624734878919).

1200200000121 is a wasteful number, since it uses less digits than its factorization.

1200200000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266877 (or 266874 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200200000121 its reverse (1210000020021), we get a palindrome (2410200020142).

The spelling of 1200200000121 in words is "one trillion, two hundred billion, two hundred million, one hundred twenty-one", and thus it is an aban number.