2215971 has 8 divisors (see below), whose sum is σ = 3282960. Its totient is φ = 1477296.

The previous prime is 2215963. The next prime is 2215979. The reversal of 2215971 is 1795122.

It is an interprime number because it is at equal distance from previous prime (2215963) and next prime (2215979).

It is not a de Polignac number, because 2215971 - 2³ = 2215963 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: 82073 = 2215971 / (2 + 2 + 1 + 5 + 9 + 7 + 1).

It is not an unprimeable number, because it can be changed into a prime (2215979) 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, 41010 + ... + 41063.

It is an arithmetic number, because the mean of its divisors is an integer number (410370).

2^2215971 is an apocalyptic number.

2215971 is a deficient number, since it is larger than the sum of its proper divisors (1066989).

2215971 is an equidigital number, since it uses as much as digits as its factorization.

2215971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82082 (or 82076 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2215971 is about 1488.6137847004. The cubic root of 2215971 is about 130.3731095831.

The spelling of 2215971 in words is "two million, two hundred fifteen thousand, nine hundred seventy-one".