1200020011 has 4 divisors (see below), whose sum is σ = 1222661952. Its totient is φ = 1177378072.

The previous prime is 1200019979. The next prime is 1200020023. The reversal of 1200020011 is 1100200021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1100200021 = 43 ⋅25586047.

It is a cyclic number.

It is not a de Polignac number, because 1200020011 - 2⁵ = 1200019979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200019976 and 1200020003.

It is not an unprimeable number, because it can be changed into a prime (1200020051) 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, 11320891 + ... + 11320996.

It is an arithmetic number, because the mean of its divisors is an integer number (305665488).

Almost surely, 2^1200020011 is an apocalyptic number.

1200020011 is a deficient number, since it is larger than the sum of its proper divisors (22641941).

1200020011 is an equidigital number, since it uses as much as digits as its factorization.

1200020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22641940.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1200020011 is about 34641.3049840793. The cubic root of 1200020011 is about 1062.6644760555.

Adding to 1200020011 its reverse (1100200021), we get a palindrome (2300220032).

The spelling of 1200020011 in words is "one billion, two hundred million, twenty thousand, eleven".