6850610021 has 2 divisors, whose sum is σ = 6850610022. Its totient is φ = 6850610020.

The previous prime is 6850609979. The next prime is 6850610047. The reversal of 6850610021 is 1200160586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5582181796 + 1268428225 = 74714^2 + 35615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6850610021 - 2⁶ = 6850609957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6850619021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3425305010 + 3425305011.

It is an arithmetic number, because the mean of its divisors is an integer number (3425305011).

Almost surely, 2^6850610021 is an apocalyptic number.

It is an amenable number.

6850610021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6850610021 is an equidigital number, since it uses as much as digits as its factorization.

6850610021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 6850610021 is about 82768.4119758257. The cubic root of 6850610021 is about 1899.2249859445.

The spelling of 6850610021 in words is "six billion, eight hundred fifty million, six hundred ten thousand, twenty-one".