321978853 has 12 divisors (see below), whose sum is σ = 374858220. Its totient is φ = 275752512.

The previous prime is 321978821. The next prime is 321978889. The reversal of 321978853 is 358879123.

It can be written as a sum of positive squares in 2 ways, for example, as 164275489 + 157703364 = 12817^2 + 12558^2 .

It is not a de Polignac number, because 321978853 - 2⁵ = 321978821 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 (321978353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85825 + ... + 89497.

It is an arithmetic number, because the mean of its divisors is an integer number (31238185).

Almost surely, 2^321978853 is an apocalyptic number.

It is an amenable number.

321978853 is a deficient number, since it is larger than the sum of its proper divisors (52879367).

321978853 is a wasteful number, since it uses less digits than its factorization.

321978853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476 (or 5469 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 321978853 is about 17943.7691971336. The cubic root of 321978853 is about 685.3973952833.

The spelling of 321978853 in words is "three hundred twenty-one million, nine hundred seventy-eight thousand, eight hundred fifty-three".