12011566021 has 16 divisors (see below), whose sum is σ = 14789805184. Its totient is φ = 9499581504.

The previous prime is 12011566009. The next prime is 12011566031. The reversal of 12011566021 is 12066511021.

It is a happy number.

It is not a de Polignac number, because 12011566021 - 2¹³ = 12011557829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011566031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194686 + ... + 248848.

It is an arithmetic number, because the mean of its divisors is an integer number (924362824).

Almost surely, 2^12011566021 is an apocalyptic number.

It is an amenable number.

12011566021 is a deficient number, since it is larger than the sum of its proper divisors (2778239163).

12011566021 is a wasteful number, since it uses less digits than its factorization.

12011566021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56620.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 12011566021 in words is "twelve billion, eleven million, five hundred sixty-six thousand, twenty-one".