6694021 has 2 divisors, whose sum is σ = 6694022. Its totient is φ = 6694020.

The previous prime is 6694019. The next prime is 6694087. The reversal of 6694021 is 1204966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6076225 + 617796 = 2465^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 6694021 - 2¹ = 6694019 is a prime.

Together with 6694019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6694001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3347010 + 3347011.

It is an arithmetic number, because the mean of its divisors is an integer number (3347011).

Almost surely, 2^6694021 is an apocalyptic number.

It is an amenable number.

6694021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6694021 is an equidigital number, since it uses as much as digits as its factorization.

6694021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6694021 is about 2587.2806187192. The cubic root of 6694021 is about 188.4642686391.

Adding to 6694021 its reverse (1204966), we get a palindrome (7898987).

The spelling of 6694021 in words is "six million, six hundred ninety-four thousand, twenty-one".