9970221 has 8 divisors (see below), whose sum is σ = 13375840. Its totient is φ = 6605712.

The previous prime is 9970183. The next prime is 9970223. The reversal of 9970221 is 1220799.

9970221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9970221 - 2⁹ = 9969709 is a prime.

It is a Duffinian number.

9970221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9970223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9706 + ... + 10683.

It is an arithmetic number, because the mean of its divisors is an integer number (1671980).

Almost surely, 2^9970221 is an apocalyptic number.

It is an amenable number.

9970221 is a deficient number, since it is larger than the sum of its proper divisors (3405619).

9970221 is a wasteful number, since it uses less digits than its factorization.

9970221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20555.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 9970221 is about 3157.5656762766. The cubic root of 9970221 is about 215.2294000016.

The spelling of 9970221 in words is "nine million, nine hundred seventy thousand, two hundred twenty-one".