1200121212111 has 8 divisors (see below), whose sum is σ = 1600188377904. Its totient is φ = 800067427200.

The previous prime is 1200121212067. The next prime is 1200121212167. The reversal of 1200121212111 is 1112121210021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1200121212111 - 2¹⁴ = 1200121195727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121212911) 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 7 ways as a sum of consecutive naturals, for example, 3134040 + ... + 3496061.

It is an arithmetic number, because the mean of its divisors is an integer number (200023547238).

Almost surely, 2^{1200121212111} is an apocalyptic number.

1200121212111 is a deficient number, since it is larger than the sum of its proper divisors (400067165793).

1200121212111 is an equidigital number, since it uses as much as digits as its factorization.

1200121212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6690441.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1200121212111 its reverse (1112121210021), we get a palindrome (2312242422132).

The spelling of 1200121212111 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".