6000021 has 16 divisors (see below), whose sum is σ = 9037120. Its totient is φ = 3933360.

The previous prime is 6000011. The next prime is 6000023. The reversal of 6000021 is 1200006.

It is not a de Polignac number, because 6000021 - 2¹³ = 5991829 is a prime.

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

It is a Duffinian number.

6000021 is a modest number, since divided by 21 gives 6 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 5999967 and 6000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 3468.

It is an arithmetic number, because the mean of its divisors is an integer number (564820).

Almost surely, 2^6000021 is an apocalyptic number.

6000021 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6000021 is a deficient number, since it is larger than the sum of its proper divisors (3037099).

6000021 is a wasteful number, since it uses less digits than its factorization.

6000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713 (or 3707 counting only the distinct ones).

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

The square root of 6000021 is about 2449.4940293865. The cubic root of 6000021 is about 181.7122712804.

Adding to 6000021 its reverse (1200006), we get a palindrome (7200027).

The spelling of 6000021 in words is "six million, twenty-one", and thus it is an aban number and an uban number.