2421715657 has 2 divisors, whose sum is σ = 2421715658. Its totient is φ = 2421715656.

The previous prime is 2421715643. The next prime is 2421715679. The reversal of 2421715657 is 7565171242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399059216 + 1022656441 = 37404^2 + 31979^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421715657 - 2⁷ = 2421715529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2421715627) 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 as a sum of consecutive naturals, namely, 1210857828 + 1210857829.

It is an arithmetic number, because the mean of its divisors is an integer number (1210857829).

Almost surely, 2^2421715657 is an apocalyptic number.

It is an amenable number.

2421715657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421715657 is an equidigital number, since it uses as much as digits as its factorization.

2421715657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 40.

The square root of 2421715657 is about 49210.9302594454. The cubic root of 2421715657 is about 1342.8918863755.

Adding to 2421715657 its reverse (7565171242), we get a palindrome (9986886899).

The spelling of 2421715657 in words is "two billion, four hundred twenty-one million, seven hundred fifteen thousand, six hundred fifty-seven".