84957221 has 4 divisors (see below), whose sum is σ = 85030944. Its totient is φ = 84883500.

The previous prime is 84957199. The next prime is 84957233. The reversal of 84957221 is 12275948.

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 not a de Polignac number, because 84957221 - 2¹⁸ = 84695077 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 (84957241) 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, 35105 + ... + 37446.

It is an arithmetic number, because the mean of its divisors is an integer number (21257736).

Almost surely, 2^84957221 is an apocalyptic number.

It is an amenable number.

84957221 is a deficient number, since it is larger than the sum of its proper divisors (73723).

84957221 is a wasteful number, since it uses less digits than its factorization.

84957221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73722.

The product of its digits is 40320, while the sum is 38.

The square root of 84957221 is about 9217.2241482997. The cubic root of 84957221 is about 439.6091932786.

The spelling of 84957221 in words is "eighty-four million, nine hundred fifty-seven thousand, two hundred twenty-one".