1200121111111 has 8 divisors (see below), whose sum is σ = 1310641474464. Its totient is φ = 1092201227040.

The previous prime is 1200121111103. The next prime is 1200121111117. The reversal of 1200121111111 is 1111111210021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200121111111 - 2³ = 1200121111103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

1200121111111 is a modest number, since divided by 1111111 gives 120012 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1200121111091 and 1200121111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121111117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650118856 + ... + 650120701.

It is an arithmetic number, because the mean of its divisors is an integer number (163830184308).

Almost surely, 2^{1200121111111} is an apocalyptic number.

1200121111111 is a deficient number, since it is larger than the sum of its proper divisors (110520363353).

1200121111111 is a wasteful number, since it uses less digits than its factorization.

1200121111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300239641.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1200121111111 its reverse (1111111210021), we get a palindrome (2311232321132).

The spelling of 1200121111111 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".