7243021 has 2 divisors, whose sum is σ = 7243022. Its totient is φ = 7243020.

The previous prime is 7243007. The next prime is 7243109. The reversal of 7243021 is 1203427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5692996 + 1550025 = 2386^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 7243021 - 2¹¹ = 7240973 is a prime.

It is a super-2 number, since 2×7243021² = 104922706412882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7243021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7243001) 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, 3621510 + 3621511.

It is an arithmetic number, because the mean of its divisors is an integer number (3621511).

Almost surely, 2^7243021 is an apocalyptic number.

It is an amenable number.

7243021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7243021 is an equidigital number, since it uses as much as digits as its factorization.

7243021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 7243021 is about 2691.2861237706. The cubic root of 7243021 is about 193.4817089945.

Adding to 7243021 its reverse (1203427), we get a palindrome (8446448).

The spelling of 7243021 in words is "seven million, two hundred forty-three thousand, twenty-one".