9722921 has 4 divisors (see below), whose sum is σ = 10470852. Its totient is φ = 8974992.

The previous prime is 9722893. The next prime is 9722939. The reversal of 9722921 is 1292279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5040025 + 4682896 = 2245^2 + 2164^2 .

It is not a de Polignac number, because 9722921 - 2¹⁰ = 9721897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9722981) 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, 373946 + ... + 373971.

It is an arithmetic number, because the mean of its divisors is an integer number (2617713).

Almost surely, 2^9722921 is an apocalyptic number.

It is an amenable number.

9722921 is a deficient number, since it is larger than the sum of its proper divisors (747931).

9722921 is a wasteful number, since it uses less digits than its factorization.

9722921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747930.

The product of its digits is 4536, while the sum is 32.

The square root of 9722921 is about 3118.1598740283. The cubic root of 9722921 is about 213.4349740817.

The spelling of 9722921 in words is "nine million, seven hundred twenty-two thousand, nine hundred twenty-one".