2215865871 has 12 divisors (see below), whose sum is σ = 3244541248. Its totient is φ = 1457007264.

The previous prime is 2215865863. The next prime is 2215865903. The reversal of 2215865871 is 1785685122.

It is not a de Polignac number, because 2215865871 - 2³ = 2215865863 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 (2215865801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1685695 + ... + 1687008.

Almost surely, 2^2215865871 is an apocalyptic number.

2215865871 is a deficient number, since it is larger than the sum of its proper divisors (1028675377).

2215865871 is a wasteful number, since it uses less digits than its factorization.

2215865871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372782 (or 3372779 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 2215865871 is about 47072.9845134128. The cubic root of 2215865871 is about 1303.7104785162.

The spelling of 2215865871 in words is "two billion, two hundred fifteen million, eight hundred sixty-five thousand, eight hundred seventy-one".