321645132 has 18 divisors (see below), whose sum is σ = 813047508. Its totient is φ = 107215032.

The previous prime is 321645127. The next prime is 321645139. The reversal of 321645132 is 231546123.

321645132 is a `hidden beast` number, since 3 + 2 + 1 + 645 + 13 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 321645096 and 321645105.

It is not an unprimeable number, because it can be changed into a prime (321645139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4467258 + ... + 4467329.

It is an arithmetic number, because the mean of its divisors is an integer number (45169306).

Almost surely, 2^321645132 is an apocalyptic number.

It is an amenable number.

321645132 is an abundant number, since it is smaller than the sum of its proper divisors (491402376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321645132 is a wasteful number, since it uses less digits than its factorization.

321645132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8934597 (or 8934592 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 321645132 is about 17934.4677088560. The cubic root of 321645132 is about 685.1605157782.

Subtracting from 321645132 its reverse (231546123), we obtain a palindrome (90099009).

The spelling of 321645132 in words is "three hundred twenty-one million, six hundred forty-five thousand, one hundred thirty-two".