2008421 has 2 divisors, whose sum is σ = 2008422. Its totient is φ = 2008420.

The previous prime is 2008403. The next prime is 2008427. The reversal of 2008421 is 1248002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 9025 = 1414^2 + 95^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2008421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2008421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2008427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004210 + 1004211.

It is an arithmetic number, because the mean of its divisors is an integer number (1004211).

2^2008421 is an apocalyptic number.

It is an amenable number.

2008421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2008421 is an equidigital number, since it uses as much as digits as its factorization.

2008421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2008421 is about 1417.1877081036. The cubic root of 2008421 is about 126.1686873070.

The spelling of 2008421 in words is "two million, eight thousand, four hundred twenty-one".