1200121212311 has 12 divisors (see below), whose sum is σ = 1415183474592. Its totient is φ = 1014583879008.

The previous prime is 1200121212281. The next prime is 1200121212331. The reversal of 1200121212311 is 1132121210021.

It is a happy number.

It is not a de Polignac number, because 1200121212311 - 2⁶ = 1200121212247 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 1200121212311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121212331) 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 11 ways as a sum of consecutive naturals, for example, 167751695 + ... + 167758848.

It is an arithmetic number, because the mean of its divisors is an integer number (117931956216).

Almost surely, 2^{1200121212311} is an apocalyptic number.

1200121212311 is a deficient number, since it is larger than the sum of its proper divisors (215062262281).

1200121212311 is an equidigital number, since it uses as much as digits as its factorization.

1200121212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335510630 (or 335510623 counting only the distinct ones).

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

Adding to 1200121212311 its reverse (1132121210021), we get a palindrome (2332242422332).

The spelling of 1200121212311 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twelve thousand, three hundred eleven".