2765351221 has 2 divisors, whose sum is σ = 2765351222. Its totient is φ = 2765351220.

The previous prime is 2765351209. The next prime is 2765351227. The reversal of 2765351221 is 1221535672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2612334321 + 153016900 = 51111^2 + 12370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2765351221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2765351227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1382675610 + 1382675611.

It is an arithmetic number, because the mean of its divisors is an integer number (1382675611).

Almost surely, 2^2765351221 is an apocalyptic number.

It is an amenable number.

2765351221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2765351221 is an equidigital number, since it uses as much as digits as its factorization.

2765351221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 2765351221 is about 52586.6068595417. The cubic root of 2765351221 is about 1403.6217824486.

Adding to 2765351221 its reverse (1221535672), we get a palindrome (3986886893).

The spelling of 2765351221 in words is "two billion, seven hundred sixty-five million, three hundred fifty-one thousand, two hundred twenty-one".