2171215 has 4 divisors (see below), whose sum is σ = 2605464. Its totient is φ = 1736968.

The previous prime is 2171203. The next prime is 2171219. The reversal of 2171215 is 5121712.

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 2171215 - 2⁹ = 2170703 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2171192 and 2171201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217117 + ... + 217126.

It is an arithmetic number, because the mean of its divisors is an integer number (651366).

2^2171215 is an apocalyptic number.

2171215 is a deficient number, since it is larger than the sum of its proper divisors (434249).

2171215 is an equidigital number, since it uses as much as digits as its factorization.

2171215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434248.

The product of its digits is 140, while the sum is 19.

The square root of 2171215 is about 1473.5043264273. The cubic root of 2171215 is about 129.4894174007.

Adding to 2171215 its reverse (5121712), we get a palindrome (7292927).

The spelling of 2171215 in words is "two million, one hundred seventy-one thousand, two hundred fifteen".