2421821609 has 2 divisors, whose sum is σ = 2421821610. Its totient is φ = 2421821608.

The previous prime is 2421821543. The next prime is 2421821617. The reversal of 2421821609 is 9061281242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2152960000 + 268861609 = 46400^2 + 16397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421821609 - 2²⁴ = 2405044393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2421821509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210910804 + 1210910805.

It is an arithmetic number, because the mean of its divisors is an integer number (1210910805).

Almost surely, 2^2421821609 is an apocalyptic number.

It is an amenable number.

2421821609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421821609 is an equidigital number, since it uses as much as digits as its factorization.

2421821609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 2421821609 is about 49212.0067564817. The cubic root of 2421821609 is about 1342.9114702885.

The spelling of 2421821609 in words is "two billion, four hundred twenty-one million, eight hundred twenty-one thousand, six hundred nine".