6366021 has 16 divisors (see below), whose sum is σ = 8838720. Its totient is φ = 4072320.

The previous prime is 6366001. The next prime is 6366023. The reversal of 6366021 is 1206636.

It is not a de Polignac number, because 6366021 - 2²² = 2171717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6365982 and 6366000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6366023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7465 + ... + 8273.

It is an arithmetic number, because the mean of its divisors is an integer number (552420).

Almost surely, 2^6366021 is an apocalyptic number.

6366021 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6366021 is a deficient number, since it is larger than the sum of its proper divisors (2472699).

6366021 is a wasteful number, since it uses less digits than its factorization.

6366021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 6366021 is about 2523.0975010887. The cubic root of 6366021 is about 185.3343939895.

The spelling of 6366021 in words is "six million, three hundred sixty-six thousand, twenty-one".