2205077821 has 2 divisors, whose sum is σ = 2205077822. Its totient is φ = 2205077820.

The previous prime is 2205077767. The next prime is 2205077839. The reversal of 2205077821 is 1287705022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 1101908025 = 33214^2 + 33195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205077821 - 2²⁷ = 2070860093 is a prime.

It is a super-2 number, since 2×2205077821² = 9724736393332216082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2205077881) 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, 1102538910 + 1102538911.

It is an arithmetic number, because the mean of its divisors is an integer number (1102538911).

Almost surely, 2^2205077821 is an apocalyptic number.

It is an amenable number.

2205077821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205077821 is an equidigital number, since it uses as much as digits as its factorization.

2205077821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 2205077821 is about 46958.2561537372. The cubic root of 2205077821 is about 1301.5913098873.

The spelling of 2205077821 in words is "two billion, two hundred five million, seventy-seven thousand, eight hundred twenty-one".