7021997 has 2 divisors, whose sum is σ = 7021998. Its totient is φ = 7021996.

The previous prime is 7021981. The next prime is 7021999. The reversal of 7021997 is 7991207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4553956 + 2468041 = 2134^2 + 1571^2 .

It is a cyclic number.

It is not a de Polignac number, because 7021997 - 2⁴ = 7021981 is a prime.

Together with 7021999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7021999) 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 as a sum of consecutive naturals, namely, 3510998 + 3510999.

It is an arithmetic number, because the mean of its divisors is an integer number (3510999).

Almost surely, 2^7021997 is an apocalyptic number.

It is an amenable number.

7021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021997 is an equidigital number, since it uses as much as digits as its factorization.

7021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 7021997 is about 2649.9050926401. The cubic root of 7021997 is about 191.4932837417.

The spelling of 7021997 in words is "seven million, twenty-one thousand, nine hundred ninety-seven".