83844893221 has 4 divisors (see below), whose sum is σ = 83862391212. Its totient is φ = 83827395232.

The previous prime is 83844893207. The next prime is 83844893263. The reversal of 83844893221 is 12239844838.

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 77542756225 + 6302136996 = 278465^2 + 79386^2 .

It is a cyclic number.

It is not a de Polignac number, because 83844893221 - 2⁵ = 83844893189 is a prime.

It is a super-2 number, since 2×83844893221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83844893291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8741806 + ... + 8751391.

It is an arithmetic number, because the mean of its divisors is an integer number (20965597803).

Almost surely, 2^83844893221 is an apocalyptic number.

It is an amenable number.

83844893221 is a deficient number, since it is larger than the sum of its proper divisors (17497991).

83844893221 is a wasteful number, since it uses less digits than its factorization.

83844893221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17497990.

The product of its digits is 2654208, while the sum is 52.

The spelling of 83844893221 in words is "eighty-three billion, eight hundred forty-four million, eight hundred ninety-three thousand, two hundred twenty-one".