6633421 has 2 divisors, whose sum is σ = 6633422. Its totient is φ = 6633420.

The previous prime is 6633391. The next prime is 6633433. The reversal of 6633421 is 1243366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5336100 + 1297321 = 2310^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 6633421 - 2⁷ = 6633293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6633461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3316710 + 3316711.

It is an arithmetic number, because the mean of its divisors is an integer number (3316711).

Almost surely, 2^6633421 is an apocalyptic number.

It is an amenable number.

6633421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6633421 is an equidigital number, since it uses as much as digits as its factorization.

6633421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

The square root of 6633421 is about 2575.5428553996. The cubic root of 6633421 is about 187.8938305777.

Adding to 6633421 its reverse (1243366), we get a palindrome (7876787).

The spelling of 6633421 in words is "six million, six hundred thirty-three thousand, four hundred twenty-one".