6997021 has 2 divisors, whose sum is σ = 6997022. Its totient is φ = 6997020.

The previous prime is 6996989. The next prime is 6997043. The reversal of 6997021 is 1207996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 164025 = 2614^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 6997021 - 2⁵ = 6996989 is a prime.

It is equal to p₄₇₆₄₄₉ and since 6997021 and 476449 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6997321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3498510 + 3498511.

It is an arithmetic number, because the mean of its divisors is an integer number (3498511).

Almost surely, 2^6997021 is an apocalyptic number.

It is an amenable number.

6997021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6997021 is an equidigital number, since it uses as much as digits as its factorization.

6997021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 6997021 is about 2645.1882730724. The cubic root of 6997021 is about 191.2659781316.

The spelling of 6997021 in words is "six million, nine hundred ninety-seven thousand, twenty-one".