851307021 has 12 divisors (see below), whose sum is σ = 1232605920. Its totient is φ = 566181000.

The previous prime is 851307019. The next prime is 851307031. The reversal of 851307021 is 120703158.

It is not a de Polignac number, because 851307021 - 2¹ = 851307019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851307031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109105 + ... + 116646.

It is an arithmetic number, because the mean of its divisors is an integer number (102717160).

Almost surely, 2^851307021 is an apocalyptic number.

It is an amenable number.

851307021 is a deficient number, since it is larger than the sum of its proper divisors (381298899).

851307021 is a wasteful number, since it uses less digits than its factorization.

851307021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226176 (or 226173 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 851307021 is about 29177.1660892555. The cubic root of 851307021 is about 947.7535177441.

The spelling of 851307021 in words is "eight hundred fifty-one million, three hundred seven thousand, twenty-one".