7021979 has 2 divisors, whose sum is σ = 7021980. Its totient is φ = 7021978.

The previous prime is 7021951. The next prime is 7021981. The reversal of 7021979 is 9791207.

7021979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7021979 - 2⁸ = 7021723 is a prime.

Together with 7021981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7021939) 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, 3510989 + 3510990.

It is an arithmetic number, because the mean of its divisors is an integer number (3510990).

Almost surely, 2^7021979 is an apocalyptic number.

7021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021979 is an equidigital number, since it uses as much as digits as its factorization.

7021979 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 7021979 is about 2649.9016962899. The cubic root of 7021979 is about 191.4931201186.

It can be divided in two parts, 7021 and 979, that added together give a cube (8000 = 20³).

The spelling of 7021979 in words is "seven million, twenty-one thousand, nine hundred seventy-nine".