3012000021 has 12 divisors (see below), whose sum is σ = 4491011200. Its totient is φ = 1943225640.

The previous prime is 3012000011. The next prime is 3012000037. The reversal of 3012000021 is 1200002103.

It is a happy number.

It is not a de Polignac number, because 3012000021 - 2⁶ = 3011999957 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3011999967 and 3012000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3012000011) 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, 5397571 + ... + 5398128.

Almost surely, 2^3012000021 is an apocalyptic number.

3012000021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3012000021 is a deficient number, since it is larger than the sum of its proper divisors (1479011179).

3012000021 is a wasteful number, since it uses less digits than its factorization.

3012000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795736 (or 10795733 counting only the distinct ones).

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

The square root of 3012000021 is about 54881.6911273696. The cubic root of 3012000021 is about 1444.1700147742.

Adding to 3012000021 its reverse (1200002103), we get a palindrome (4212002124).

The spelling of 3012000021 in words is "three billion, twelve million, twenty-one", and thus it is an aban number and an uban number.