321660007 has 4 divisors (see below), whose sum is σ = 321924240. Its totient is φ = 321395776.

The previous prime is 321659983. The next prime is 321660011. The reversal of 321660007 is 700066123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321660007 - 2¹⁹ = 321135719 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 (321660067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130282 + ... + 132727.

It is an arithmetic number, because the mean of its divisors is an integer number (80481060).

Almost surely, 2^321660007 is an apocalyptic number.

321660007 is a deficient number, since it is larger than the sum of its proper divisors (264233).

321660007 is a wasteful number, since it uses less digits than its factorization.

321660007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264232.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 321660007 is about 17934.8824083126. The cubic root of 321660007 is about 685.1710777346.

The spelling of 321660007 in words is "three hundred twenty-one million, six hundred sixty thousand, seven".