18000006000021 has 12 divisors (see below), whose sum is σ = 26033818831020. Its totient is φ = 11984399308800.

The previous prime is 18000006000019. The next prime is 18000006000023. The reversal of 18000006000021 is 12000060000081.

It is an interprime number because it is at equal distance from previous prime (18000006000019) and next prime (18000006000023).

It can be written as a sum of positive squares in 2 ways, for example, as 6018612197796 + 11981393802225 = 2453286^2 + 3461415^2 .

It is not a de Polignac number, because 18000006000021 - 2¹ = 18000006000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18000005999958 and 18000006000003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000006000023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1300383630 + ... + 1300397471.

It is an arithmetic number, because the mean of its divisors is an integer number (2169484902585).

Almost surely, 2^{18000006000021} is an apocalyptic number.

It is an amenable number.

18000006000021 is a deficient number, since it is larger than the sum of its proper divisors (8033812830999).

18000006000021 is a wasteful number, since it uses less digits than its factorization.

18000006000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600781876 (or 2600781873 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The spelling of 18000006000021 in words is "eighteen trillion, six million, twenty-one", and thus it is an aban number and an uban number.