9881221 has 4 divisors (see below), whose sum is σ = 11292832. Its totient is φ = 8469612.

The previous prime is 9881203. The next prime is 9881231. The reversal of 9881221 is 1221889.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221889 = 103 ⋅11863.

It is a cyclic number.

It is not a de Polignac number, because 9881221 - 2⁹ = 9880709 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 (9881231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705795 + ... + 705808.

It is an arithmetic number, because the mean of its divisors is an integer number (2823208).

Almost surely, 2^9881221 is an apocalyptic number.

It is an amenable number.

9881221 is a deficient number, since it is larger than the sum of its proper divisors (1411611).

9881221 is a wasteful number, since it uses less digits than its factorization.

9881221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411610.

The product of its digits is 2304, while the sum is 31.

The square root of 9881221 is about 3143.4409490239. The cubic root of 9881221 is about 214.5870639081.

It can be divided in two parts, 988 and 1221, that added together give a square (2209 = 47²).

The spelling of 9881221 in words is "nine million, eight hundred eighty-one thousand, two hundred twenty-one".