12011021011 has 4 divisors (see below), whose sum is σ = 13102932024. Its totient is φ = 10919110000.

The previous prime is 12011021003. The next prime is 12011021027. The reversal of 12011021011 is 11012011021.

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 12011021011 - 2³ = 12011021003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545955490 + ... + 545955511.

It is an arithmetic number, because the mean of its divisors is an integer number (3275733006).

Almost surely, 2^12011021011 is an apocalyptic number.

12011021011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011021011 is a deficient number, since it is larger than the sum of its proper divisors (1091911013).

12011021011 is a wasteful number, since it uses less digits than its factorization.

12011021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091911012.

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

Adding to 12011021011 its reverse (11012011021), we get a palindrome (23023032032).

The spelling of 12011021011 in words is "twelve billion, eleven million, twenty-one thousand, eleven".