1200123121211 has 4 divisors (see below), whose sum is σ = 1371569281392. Its totient is φ = 1028676961032.

The previous prime is 1200123121207. The next prime is 1200123121213. The reversal of 1200123121211 is 1121213210021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1200123121211 - 2² = 1200123121207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200123121211.

It is not an unprimeable number, because it can be changed into a prime (1200123121213) 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 3 ways as a sum of consecutive naturals, for example, 85723080080 + ... + 85723080093.

It is an arithmetic number, because the mean of its divisors is an integer number (342892320348).

Almost surely, 2^{1200123121211} is an apocalyptic number.

1200123121211 is a deficient number, since it is larger than the sum of its proper divisors (171446160181).

1200123121211 is an equidigital number, since it uses as much as digits as its factorization.

1200123121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171446160180.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1200123121211 its reverse (1121213210021), we get a palindrome (2321336331232).

The spelling of 1200123121211 in words is "one trillion, two hundred billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred eleven".