9702221 has 4 divisors (see below), whose sum is σ = 9838944. Its totient is φ = 9565500.

The previous prime is 9702197. The next prime is 9702229. The reversal of 9702221 is 1222079.

9702221 = T₁₈₉ + T₁₉₀ + ... + T₄₀₁.

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: 1222079 = 17 ⋅71887.

It is a cyclic number.

It is not a de Polignac number, because 9702221 - 2¹⁸ = 9440077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9702229) 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, 68255 + ... + 68396.

It is an arithmetic number, because the mean of its divisors is an integer number (2459736).

Almost surely, 2^9702221 is an apocalyptic number.

It is an amenable number.

9702221 is a deficient number, since it is larger than the sum of its proper divisors (136723).

9702221 is a wasteful number, since it uses less digits than its factorization.

9702221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136722.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 9702221 is about 3114.8388401328. The cubic root of 9702221 is about 213.2833995002.

The spelling of 9702221 in words is "nine million, seven hundred two thousand, two hundred twenty-one".