2776222721 has 2 divisors, whose sum is σ = 2776222722. Its totient is φ = 2776222720.

The previous prime is 2776222703. The next prime is 2776222769. The reversal of 2776222721 is 1272226772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653235600 + 1122987121 = 40660^2 + 33511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2776222721 - 2²² = 2772028417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2776222021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388111360 + 1388111361.

It is an arithmetic number, because the mean of its divisors is an integer number (1388111361).

Almost surely, 2^2776222721 is an apocalyptic number.

It is an amenable number.

2776222721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2776222721 is an equidigital number, since it uses as much as digits as its factorization.

2776222721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 38.

The square root of 2776222721 is about 52689.8730402722. The cubic root of 2776222721 is about 1405.4587427343.

The spelling of 2776222721 in words is "two billion, seven hundred seventy-six million, two hundred twenty-two thousand, seven hundred twenty-one".