321661271 has 8 divisors (see below), whose sum is σ = 327097344. Its totient is φ = 316262520.

The previous prime is 321661237. The next prime is 321661273. The reversal of 321661271 is 172166123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321661271 is a prime.

It is a super-2 number, since 2×321661271² = 206931946522670882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321661273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8330 + ... + 26696.

It is an arithmetic number, because the mean of its divisors is an integer number (40887168).

Almost surely, 2^321661271 is an apocalyptic number.

321661271 is a deficient number, since it is larger than the sum of its proper divisors (5436073).

321661271 is a wasteful number, since it uses less digits than its factorization.

321661271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18661.

The product of its digits is 3024, while the sum is 29.

The square root of 321661271 is about 17934.9176468698. The cubic root of 321661271 is about 685.1719752196.

The spelling of 321661271 in words is "three hundred twenty-one million, six hundred sixty-one thousand, two hundred seventy-one".