850426021 has 2 divisors, whose sum is σ = 850426022. Its totient is φ = 850426020.

The previous prime is 850426009. The next prime is 850426097. The reversal of 850426021 is 120624058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671535396 + 178890625 = 25914^2 + 13375^2 .

It is a cyclic number.

It is not a de Polignac number, because 850426021 - 2⁹ = 850425509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850426121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425213010 + 425213011.

It is an arithmetic number, because the mean of its divisors is an integer number (425213011).

Almost surely, 2^850426021 is an apocalyptic number.

It is an amenable number.

850426021 is a deficient number, since it is larger than the sum of its proper divisors (1).

850426021 is an equidigital number, since it uses as much as digits as its factorization.

850426021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 850426021 is about 29162.0647588610. The cubic root of 850426021 is about 947.4264680720.

The spelling of 850426021 in words is "eight hundred fifty million, four hundred twenty-six thousand, twenty-one".