2421257917 has 4 divisors (see below), whose sum is σ = 2607508540. Its totient is φ = 2235007296.

The previous prime is 2421257903. The next prime is 2421257959. The reversal of 2421257917 is 7197521242.

2421257917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1659829081 + 761428836 = 40741^2 + 27594^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421257917 - 2⁷ = 2421257789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2421257917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421257417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93125292 + ... + 93125317.

It is an arithmetic number, because the mean of its divisors is an integer number (651877135).

Almost surely, 2^2421257917 is an apocalyptic number.

It is an amenable number.

2421257917 is a deficient number, since it is larger than the sum of its proper divisors (186250623).

2421257917 is a wasteful number, since it uses less digits than its factorization.

2421257917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186250622.

The product of its digits is 70560, while the sum is 40.

The square root of 2421257917 is about 49206.2792436087. The cubic root of 2421257917 is about 1342.8072722490.

The spelling of 2421257917 in words is "two billion, four hundred twenty-one million, two hundred fifty-seven thousand, nine hundred seventeen".