850271021 has 2 divisors, whose sum is σ = 850271022. Its totient is φ = 850271020.

The previous prime is 850271017. The next prime is 850271087. The reversal of 850271021 is 120172058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804856900 + 45414121 = 28370^2 + 6739^2 .

It is a cyclic number.

It is not a de Polignac number, because 850271021 - 2² = 850271017 is a prime.

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 (850271011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425135510 + 425135511.

It is an arithmetic number, because the mean of its divisors is an integer number (425135511).

Almost surely, 2^850271021 is an apocalyptic number.

It is an amenable number.

850271021 is a deficient number, since it is larger than the sum of its proper divisors (1).

850271021 is an equidigital number, since it uses as much as digits as its factorization.

850271021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 850271021 is about 29159.4070755905. The cubic root of 850271021 is about 947.3689047560.

The spelling of 850271021 in words is "eight hundred fifty million, two hundred seventy-one thousand, twenty-one".