83855021 has 4 divisors (see below), whose sum is σ = 83926044. Its totient is φ = 83784000.

The previous prime is 83855017. The next prime is 83855029. The reversal of 83855021 is 12055838.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2656900 + 81198121 = 1630^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 83855021 - 2² = 83855017 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 (83855029) 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 3 ways as a sum of consecutive naturals, for example, 33710 + ... + 36111.

It is an arithmetic number, because the mean of its divisors is an integer number (20981511).

Almost surely, 2^83855021 is an apocalyptic number.

It is an amenable number.

83855021 is a deficient number, since it is larger than the sum of its proper divisors (71023).

83855021 is a wasteful number, since it uses less digits than its factorization.

83855021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71022.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 83855021 is about 9157.2387213614. The cubic root of 83855021 is about 437.6998092489.

The spelling of 83855021 in words is "eighty-three million, eight hundred fifty-five thousand, twenty-one".