12000000000021 has 32 divisors (see below), whose sum is σ = 18150962872320. Its totient is φ = 6985179364800.

The previous prime is 12000000000017. The next prime is 12000000000047.

It is a happy number.

12000000000021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12000000000021 - 2² = 12000000000017 is a prime.

12000000000021 is a modest number, since divided by 21 gives 12 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11999999999919 and 12000000000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000000000421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32642305 + ... + 33007878.

It is an arithmetic number, because the mean of its divisors is an integer number (567217589760).

Almost surely, 2^{12000000000021} is an apocalyptic number.

12000000000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12000000000021 is a deficient number, since it is larger than the sum of its proper divisors (6150962872299).

12000000000021 is a wasteful number, since it uses less digits than its factorization.

12000000000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65650417.

The product of its (nonzero) digits is 4, while the sum is 6.

It can be divided in two parts, 120000000000 and 21, that added together give a palindrome (120000000021).

The spelling of 12000000000021 in words is "twelve trillion, twenty-one", and thus it is an aban number and an uban number.