921058321 has 2 divisors, whose sum is σ = 921058322. Its totient is φ = 921058320.

The previous prime is 921058319. The next prime is 921058373. The reversal of 921058321 is 123850129.

921058321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649995025 + 271063296 = 25495^2 + 16464^2 .

It is a cyclic number.

It is not a de Polignac number, because 921058321 - 2¹ = 921058319 is a prime.

Together with 921058319, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (921008321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460529160 + 460529161.

It is an arithmetic number, because the mean of its divisors is an integer number (460529161).

Almost surely, 2^921058321 is an apocalyptic number.

It is an amenable number.

921058321 is a deficient number, since it is larger than the sum of its proper divisors (1).

921058321 is an equidigital number, since it uses as much as digits as its factorization.

921058321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 921058321 is about 30348.9426669200. The cubic root of 921058321 is about 972.9616221399.

The spelling of 921058321 in words is "nine hundred twenty-one million, fifty-eight thousand, three hundred twenty-one".