9973221 has 4 divisors (see below), whose sum is σ = 13297632. Its totient is φ = 6648812.

The previous prime is 9973219. The next prime is 9973241. The reversal of 9973221 is 1223799.

9973221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9973221 - 2¹ = 9973219 is a prime.

It is a super-2 number, since 2×9973221² = 198930274229682, which contains 22 as substring.

9973221 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9973211) 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, 1662201 + ... + 1662206.

It is an arithmetic number, because the mean of its divisors is an integer number (3324408).

Almost surely, 2^9973221 is an apocalyptic number.

It is an amenable number.

9973221 is a deficient number, since it is larger than the sum of its proper divisors (3324411).

9973221 is a wasteful number, since it uses less digits than its factorization.

9973221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324410.

The product of its digits is 6804, while the sum is 33.

The square root of 9973221 is about 3158.0406900482. The cubic root of 9973221 is about 215.2509850613.

The spelling of 9973221 in words is "nine million, nine hundred seventy-three thousand, two hundred twenty-one".