2421904257 has 24 divisors (see below), whose sum is σ = 3524871168. Its totient is φ = 1602384000.

The previous prime is 2421904249. The next prime is 2421904279. The reversal of 2421904257 is 7524091242.

2421904257 is a `hidden beast` number, since 2 + 42 + 190 + 425 + 7 = 666.

It is not a de Polignac number, because 2421904257 - 2³ = 2421904249 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2421904207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 863257 + ... + 866057.

It is an arithmetic number, because the mean of its divisors is an integer number (146869632).

Almost surely, 2^2421904257 is an apocalyptic number.

It is an amenable number.

2421904257 is a deficient number, since it is larger than the sum of its proper divisors (1102966911).

2421904257 is a wasteful number, since it uses less digits than its factorization.

2421904257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3501 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 2421904257 is about 49212.8464630934. The cubic root of 2421904257 is about 1342.9267463496.

Adding to 2421904257 its reverse (7524091242), we get a palindrome (9945995499).

The spelling of 2421904257 in words is "two billion, four hundred twenty-one million, nine hundred four thousand, two hundred fifty-seven".