2171181321 has 8 divisors (see below), whose sum is σ = 3216564960. Its totient is φ = 1447454196.

The previous prime is 2171181307. The next prime is 2171181371. The reversal of 2171181321 is 1231811712.

It is not a de Polignac number, because 2171181321 - 2¹¹ = 2171179273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 80414123 = 2171181321 / (2 + 1 + 7 + 1 + 1 + 8 + 1 + 3 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2171181371) 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, 40207035 + ... + 40207088.

It is an arithmetic number, because the mean of its divisors is an integer number (402070620).

Almost surely, 2^2171181321 is an apocalyptic number.

It is an amenable number.

2171181321 is a deficient number, since it is larger than the sum of its proper divisors (1045383639).

2171181321 is an equidigital number, since it uses as much as digits as its factorization.

2171181321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80414132 (or 80414126 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 2171181321 is about 46595.9367434544. The cubic root of 2171181321 is about 1294.8874786826.

The spelling of 2171181321 in words is "two billion, one hundred seventy-one million, one hundred eighty-one thousand, three hundred twenty-one".