7021139 has 2 divisors, whose sum is σ = 7021140. Its totient is φ = 7021138.

The previous prime is 7021117. The next prime is 7021163. The reversal of 7021139 is 9311207.

It is a weak prime.

It is an emirp because it is prime and its reverse (9311207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7021139 - 2¹⁶ = 6955603 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7021199) 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, 3510569 + 3510570.

It is an arithmetic number, because the mean of its divisors is an integer number (3510570).

Almost surely, 2^7021139 is an apocalyptic number.

7021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021139 is an equidigital number, since it uses as much as digits as its factorization.

7021139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 7021139 is about 2649.7431951040. The cubic root of 7021139 is about 191.4854840645.

The spelling of 7021139 in words is "seven million, twenty-one thousand, one hundred thirty-nine".