83871221 has 4 divisors (see below), whose sum is σ = 95852832. Its totient is φ = 71889612.

The previous prime is 83871211. The next prime is 83871239. The reversal of 83871221 is 12217838.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83871221 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 (83871211) 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, 5990795 + ... + 5990808.

It is an arithmetic number, because the mean of its divisors is an integer number (23963208).

Almost surely, 2^83871221 is an apocalyptic number.

It is an amenable number.

83871221 is a deficient number, since it is larger than the sum of its proper divisors (11981611).

83871221 is a wasteful number, since it uses less digits than its factorization.

83871221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11981610.

The product of its digits is 5376, while the sum is 32.

The square root of 83871221 is about 9158.1232247661. The cubic root of 83871221 is about 437.7279939270.

The spelling of 83871221 in words is "eighty-three million, eight hundred seventy-one thousand, two hundred twenty-one".