859434021 has 6 divisors (see below), whose sum is σ = 1241404710. Its totient is φ = 572956008.

The previous prime is 859434007. The next prime is 859434067. The reversal of 859434021 is 120434958.

859434021 is a `hidden beast` number, since 8 + 594 + 3 + 40 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 740384100 + 119049921 = 27210^2 + 10911^2 .

It is not a de Polignac number, because 859434021 - 2¹⁰ = 859432997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859434221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47746326 + ... + 47746343.

It is an arithmetic number, because the mean of its divisors is an integer number (206900785).

Almost surely, 2^859434021 is an apocalyptic number.

It is an amenable number.

859434021 is a deficient number, since it is larger than the sum of its proper divisors (381970689).

859434021 is a wasteful number, since it uses less digits than its factorization.

859434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95492675 (or 95492672 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 859434021 is about 29316.1051471712. The cubic root of 859434021 is about 950.7598799340.

Adding to 859434021 its reverse (120434958), we get a palindrome (979868979).

The spelling of 859434021 in words is "eight hundred fifty-nine million, four hundred thirty-four thousand, twenty-one".