7705321321 has 2 divisors, whose sum is σ = 7705321322. Its totient is φ = 7705321320.

The previous prime is 7705321319. The next prime is 7705321367. The reversal of 7705321321 is 1231235077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3876805696 + 3828515625 = 62264^2 + 61875^2 .

It is a cyclic number.

It is not a de Polignac number, because 7705321321 - 2¹ = 7705321319 is a prime.

Together with 7705321319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7705321301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3852660660 + 3852660661.

It is an arithmetic number, because the mean of its divisors is an integer number (3852660661).

Almost surely, 2^7705321321 is an apocalyptic number.

It is an amenable number.

7705321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7705321321 is an equidigital number, since it uses as much as digits as its factorization.

7705321321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 7705321321 is about 87779.9596775938. The cubic root of 7705321321 is about 1975.1356053661.

Adding to 7705321321 its reverse (1231235077), we get a palindrome (8936556398).

The spelling of 7705321321 in words is "seven billion, seven hundred five million, three hundred twenty-one thousand, three hundred twenty-one".