2405705321 has 2 divisors, whose sum is σ = 2405705322. Its totient is φ = 2405705320.

The previous prime is 2405705287. The next prime is 2405705327. The reversal of 2405705321 is 1235075042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1775695321 + 630010000 = 42139^2 + 25100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2405705321 - 2²⁶ = 2338596457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2405705327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1202852660 + 1202852661.

It is an arithmetic number, because the mean of its divisors is an integer number (1202852661).

Almost surely, 2^2405705321 is an apocalyptic number.

It is an amenable number.

2405705321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2405705321 is an equidigital number, since it uses as much as digits as its factorization.

2405705321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 2405705321 is about 49047.9899792030. The cubic root of 2405705321 is about 1339.9259855533.

The spelling of 2405705321 in words is "two billion, four hundred five million, seven hundred five thousand, three hundred twenty-one".