1200020111 has 4 divisors (see below), whose sum is σ = 1210639872. Its totient is φ = 1189400352.

The previous prime is 1200020093. The next prime is 1200020141. The reversal of 1200020111 is 1110200021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200020111 - 2³⁰ = 126278287 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 (1200020141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5309711 + ... + 5309936.

It is an arithmetic number, because the mean of its divisors is an integer number (302659968).

Almost surely, 2^1200020111 is an apocalyptic number.

1200020111 is a deficient number, since it is larger than the sum of its proper divisors (10619761).

1200020111 is a wasteful number, since it uses less digits than its factorization.

1200020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619760.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1200020111 is about 34641.3064274429. The cubic root of 1200020111 is about 1062.6645055735.

Adding to 1200020111 its reverse (1110200021), we get a palindrome (2310220132).

The spelling of 1200020111 in words is "one billion, two hundred million, twenty thousand, one hundred eleven".