6421243 has 2 divisors, whose sum is σ = 6421244. Its totient is φ = 6421242.

The previous prime is 6421237. The next prime is 6421249. The reversal of 6421243 is 3421246.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (6421237) and next prime (6421249).

It is a cyclic number.

It is not a de Polignac number, because 6421243 - 2⁵ = 6421211 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210621 + 3210622.

It is an arithmetic number, because the mean of its divisors is an integer number (3210622).

Almost surely, 2^6421243 is an apocalyptic number.

6421243 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421243 is an equidigital number, since it uses as much as digits as its factorization.

6421243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

The square root of 6421243 is about 2534.0171664770. The cubic root of 6421243 is about 185.8687458013.

Adding to 6421243 its reverse (3421246), we get a palindrome (9842489).

The spelling of 6421243 in words is "six million, four hundred twenty-one thousand, two hundred forty-three".