2720266321 has 2 divisors, whose sum is σ = 2720266322. Its totient is φ = 2720266320.

The previous prime is 2720266277. The next prime is 2720266349. The reversal of 2720266321 is 1236620272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1595603025 + 1124663296 = 39945^2 + 33536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2720266321 - 2⁷ = 2720266193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2720266421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360133160 + 1360133161.

It is an arithmetic number, because the mean of its divisors is an integer number (1360133161).

Almost surely, 2^2720266321 is an apocalyptic number.

It is an amenable number.

2720266321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2720266321 is an equidigital number, since it uses as much as digits as its factorization.

2720266321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 2720266321 is about 52156.1724151610. The cubic root of 2720266321 is about 1395.9519666193.

Adding to 2720266321 its reverse (1236620272), we get a palindrome (3956886593).

The spelling of 2720266321 in words is "two billion, seven hundred twenty million, two hundred sixty-six thousand, three hundred twenty-one".