2008421257 has 4 divisors (see below), whose sum is σ = 2008661760. Its totient is φ = 2008180756.

The previous prime is 2008421251. The next prime is 2008421267. The reversal of 2008421257 is 7521248002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2008421257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2008421251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107257 + ... + 124582.

It is an arithmetic number, because the mean of its divisors is an integer number (502165440).

Almost surely, 2^2008421257 is an apocalyptic number.

It is an amenable number.

2008421257 is a deficient number, since it is larger than the sum of its proper divisors (240503).

2008421257 is an equidigital number, since it uses as much as digits as its factorization.

2008421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240502.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 2008421257 is about 44815.4131633303. The cubic root of 2008421257 is about 1261.6869268853.

Adding to 2008421257 its reverse (7521248002), we get a palindrome (9529669259).

The spelling of 2008421257 in words is "two billion, eight million, four hundred twenty-one thousand, two hundred fifty-seven".