850786021 has 4 divisors (see below), whose sum is σ = 880123500. Its totient is φ = 821448544.

The previous prime is 850785973. The next prime is 850786037. The reversal of 850786021 is 120687058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120687058 = 2 ⋅60343529.

It can be written as a sum of positive squares in 2 ways, for example, as 634284225 + 216501796 = 25185^2 + 14714^2 .

It is a cyclic number.

It is not a de Polignac number, because 850786021 - 2¹⁷ = 850654949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850786091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14668696 + ... + 14668753.

It is an arithmetic number, because the mean of its divisors is an integer number (220030875).

Almost surely, 2^850786021 is an apocalyptic number.

It is an amenable number.

850786021 is a deficient number, since it is larger than the sum of its proper divisors (29337479).

850786021 is a wasteful number, since it uses less digits than its factorization.

850786021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29337478.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 850786021 is about 29168.2365082293. The cubic root of 850786021 is about 947.5601365330.

The spelling of 850786021 in words is "eight hundred fifty million, seven hundred eighty-six thousand, twenty-one".