7021643 has 2 divisors, whose sum is σ = 7021644. Its totient is φ = 7021642.

The previous prime is 7021627. The next prime is 7021657. The reversal of 7021643 is 3461207.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7021643 - 2⁴ = 7021627 is a prime.

It is not a weakly prime, because it can be changed into another prime (7021543) 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, 3510821 + 3510822.

It is an arithmetic number, because the mean of its divisors is an integer number (3510822).

Almost surely, 2^7021643 is an apocalyptic number.

7021643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021643 is an equidigital number, since it uses as much as digits as its factorization.

7021643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 7021643 is about 2649.8382969532. The cubic root of 7021643 is about 191.4900657700.

The spelling of 7021643 in words is "seven million, twenty-one thousand, six hundred forty-three".