921322321 has 4 divisors (see below), whose sum is σ = 921620644. Its totient is φ = 921024000.

The previous prime is 921322249. The next prime is 921322349. The reversal of 921322321 is 123223129.

921322321 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 an emirpimes, since its reverse is a distinct semiprime: 123223129 = 9547 ⋅12907.

It can be written as a sum of positive squares in 2 ways, for example, as 122412096 + 798910225 = 11064^2 + 28265^2 .

It is a cyclic number.

It is not a de Polignac number, because 921322321 - 2⁹ = 921321809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921322421) 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, 144480 + ... + 150721.

It is an arithmetic number, because the mean of its divisors is an integer number (230405161).

Almost surely, 2^921322321 is an apocalyptic number.

It is an amenable number.

921322321 is a deficient number, since it is larger than the sum of its proper divisors (298323).

921322321 is a wasteful number, since it uses less digits than its factorization.

921322321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298322.

The product of its digits is 1296, while the sum is 25.

The square root of 921322321 is about 30353.2917654741. The cubic root of 921322321 is about 973.0545722189.

The spelling of 921322321 in words is "nine hundred twenty-one million, three hundred twenty-two thousand, three hundred twenty-one".