12011000021 has 16 divisors (see below), whose sum is σ = 12828170880. Its totient is φ = 11206356480.

The previous prime is 12011000011. The next prime is 12011000041. The reversal of 12011000021 is 12000011021.

It is not a de Polignac number, because 12011000021 - 2³⁰ = 10937258197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12010999972 and 12011000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011000011) 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, 1885640 + ... + 1891998.

It is an arithmetic number, because the mean of its divisors is an integer number (801760680).

Almost surely, 2^12011000021 is an apocalyptic number.

It is an amenable number.

12011000021 is a deficient number, since it is larger than the sum of its proper divisors (817170859).

12011000021 is a wasteful number, since it uses less digits than its factorization.

12011000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7324.

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

Adding to 12011000021 its reverse (12000011021), we get a palindrome (24011011042).

The spelling of 12011000021 in words is "twelve billion, eleven million, twenty-one", and thus it is an aban number and an uban number.