2426820821 has 2 divisors, whose sum is σ = 2426820822. Its totient is φ = 2426820820.

The previous prime is 2426820817. The next prime is 2426820853. The reversal of 2426820821 is 1280286242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1360798321 + 1066022500 = 36889^2 + 32650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2426820821 - 2² = 2426820817 is a prime.

It is a super-2 number, since 2×2426820821² = 11778918594478228082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2426820871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1213410410 + 1213410411.

It is an arithmetic number, because the mean of its divisors is an integer number (1213410411).

Almost surely, 2^2426820821 is an apocalyptic number.

It is an amenable number.

2426820821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2426820821 is an equidigital number, since it uses as much as digits as its factorization.

2426820821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 2426820821 is about 49262.7731761012. The cubic root of 2426820821 is about 1343.8348640660.

The spelling of 2426820821 in words is "two billion, four hundred twenty-six million, eight hundred twenty thousand, eight hundred twenty-one".