12000030021 has 12 divisors (see below), whose sum is σ = 19809573472. Its totient is φ = 6857159976.

The previous prime is 12000030011. The next prime is 12000030113. The reversal of 12000030021 is 12003000021.

It is a happy number.

12000030021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12000030021 is a prime.

It is a super-3 number, since 3×12000030021³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12000029985 and 12000030012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000030011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95238271 + ... + 95238396.

Almost surely, 2^12000030021 is an apocalyptic number.

It is an amenable number.

12000030021 is a deficient number, since it is larger than the sum of its proper divisors (7809543451).

12000030021 is a wasteful number, since it uses less digits than its factorization.

12000030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190476680 (or 190476677 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 12000030021 its reverse (12003000021), we get a palindrome (24003030042).

The spelling of 12000030021 in words is "twelve billion, thirty thousand, twenty-one".