1200121011111 has 16 divisors (see below), whose sum is σ = 1792809767808. Its totient is φ = 707688064800.

The previous prime is 1200121011109. The next prime is 1200121011119. The reversal of 1200121011111 is 1111101210021.

It is not a de Polignac number, because 1200121011111 - 2¹ = 1200121011109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121011119) 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 15 ways as a sum of consecutive naturals, for example, 491448825 + ... + 491451266.

It is an arithmetic number, because the mean of its divisors is an integer number (112050610488).

Almost surely, 2^{1200121011111} is an apocalyptic number.

1200121011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200121011111 is a deficient number, since it is larger than the sum of its proper divisors (592688756697).

1200121011111 is a wasteful number, since it uses less digits than its factorization.

1200121011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982900142.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1200121011111 its reverse (1111101210021), we get a palindrome (2311222221132).

The spelling of 1200121011111 in words is "one trillion, two hundred billion, one hundred twenty-one million, eleven thousand, one hundred eleven".