321913073 has 4 divisors (see below), whose sum is σ = 322611828. Its totient is φ = 321214320.

The previous prime is 321913051. The next prime is 321913087. The reversal of 321913073 is 370319123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370319123 = 10259 ⋅36097.

It can be written as a sum of positive squares in 2 ways, for example, as 122058304 + 199854769 = 11048^2 + 14137^2 .

It is a cyclic number.

It is not a de Polignac number, because 321913073 - 2²² = 317718769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321913873) 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, 348686 + ... + 349607.

It is an arithmetic number, because the mean of its divisors is an integer number (80652957).

Almost surely, 2^321913073 is an apocalyptic number.

It is an amenable number.

321913073 is a deficient number, since it is larger than the sum of its proper divisors (698755).

321913073 is an equidigital number, since it uses as much as digits as its factorization.

321913073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698754.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 321913073 is about 17941.9361552760. The cubic root of 321913073 is about 685.3507167402.

The spelling of 321913073 in words is "three hundred twenty-one million, nine hundred thirteen thousand, seventy-three".