9722172221 has 8 divisors (see below), whose sum is σ = 9757645560. Its totient is φ = 9686729728.

The previous prime is 9722172203. The next prime is 9722172259. The reversal of 9722172221 is 1222712279.

It can be written as a sum of positive squares in 4 ways, for example, as 415711321 + 9306460900 = 20389^2 + 96470^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9722172221 - 2³⁰ = 8648430397 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 (9722172521) 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, 759845 + ... + 772533.

It is an arithmetic number, because the mean of its divisors is an integer number (1219705695).

Almost surely, 2^9722172221 is an apocalyptic number.

It is an amenable number.

9722172221 is a deficient number, since it is larger than the sum of its proper divisors (35473339).

9722172221 is a wasteful number, since it uses less digits than its factorization.

9722172221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15423.

The product of its digits is 14112, while the sum is 35.

The square root of 9722172221 is about 98601.0761655267. The cubic root of 9722172221 is about 2134.2949494192.

The spelling of 9722172221 in words is "nine billion, seven hundred twenty-two million, one hundred seventy-two thousand, two hundred twenty-one".