6432421 has 2 divisors, whose sum is σ = 6432422. Its totient is φ = 6432420.

The previous prime is 6432401. The next prime is 6432427. The reversal of 6432421 is 1242346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6320196 + 112225 = 2514^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 6432421 - 2²¹ = 4335269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6432392 and 6432401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6432427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3216210 + 3216211.

It is an arithmetic number, because the mean of its divisors is an integer number (3216211).

Almost surely, 2^6432421 is an apocalyptic number.

It is an amenable number.

6432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6432421 is an equidigital number, since it uses as much as digits as its factorization.

6432421 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 6432421 is about 2536.2217962946. The cubic root of 6432421 is about 185.9765357536.

Adding to 6432421 its reverse (1242346), we get a palindrome (7674767).

The spelling of 6432421 in words is "six million, four hundred thirty-two thousand, four hundred twenty-one".