9807221 has 4 divisors (see below), whose sum is σ = 9867552. Its totient is φ = 9746892.

The previous prime is 9807209. The next prime is 9807233. The reversal of 9807221 is 1227089.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (9807209) and next prime (9807233).

It is a cyclic number.

It is not a de Polignac number, because 9807221 - 2¹⁰ = 9806197 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 (9800221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29921 + ... + 30246.

It is an arithmetic number, because the mean of its divisors is an integer number (2466888).

Almost surely, 2^9807221 is an apocalyptic number.

It is an amenable number.

9807221 is a deficient number, since it is larger than the sum of its proper divisors (60331).

9807221 is a wasteful number, since it uses less digits than its factorization.

9807221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60330.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 9807221 is about 3131.6482880426. The cubic root of 9807221 is about 214.0500436142.

The spelling of 9807221 in words is "nine million, eight hundred seven thousand, two hundred twenty-one".