1200211111 has 4 divisors (see below), whose sum is σ = 1309321224. Its totient is φ = 1091101000.

The previous prime is 1200211079. The next prime is 1200211183. The reversal of 1200211111 is 1111120021.

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

It is not a de Polignac number, because 1200211111 - 2⁵ = 1200211079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200211211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54555040 + ... + 54555061.

It is an arithmetic number, because the mean of its divisors is an integer number (327330306).

Almost surely, 2^1200211111 is an apocalyptic number.

1200211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200211111 is a deficient number, since it is larger than the sum of its proper divisors (109110113).

1200211111 is a wasteful number, since it uses less digits than its factorization.

1200211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109110112.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1200211111 is about 34644.0631421893. The cubic root of 1200211111 is about 1062.7208818934.

Adding to 1200211111 its reverse (1111120021), we get a palindrome (2311331132).

It can be divided in two parts, 120021 and 1111, that multiplied together give a palindrome (133343331).

The spelling of 1200211111 in words is "one billion, two hundred million, two hundred eleven thousand, one hundred eleven".