770870021 has 2 divisors, whose sum is σ = 770870022. Its totient is φ = 770870020.

The previous prime is 770870011. The next prime is 770870063. The reversal of 770870021 is 120078077.

770870021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586317796 + 184552225 = 24214^2 + 13585^2 .

It is a cyclic number.

It is not a de Polignac number, because 770870021 - 2²² = 766675717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 770870021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (770870011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385435010 + 385435011.

It is an arithmetic number, because the mean of its divisors is an integer number (385435011).

Almost surely, 2^770870021 is an apocalyptic number.

It is an amenable number.

770870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

770870021 is an equidigital number, since it uses as much as digits as its factorization.

770870021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 770870021 is about 27764.5461155049. The cubic root of 770870021 is about 916.9107238786.

The spelling of 770870021 in words is "seven hundred seventy million, eight hundred seventy thousand, twenty-one".