2131216 has 10 divisors (see below), whose sum is σ = 4129262. Its totient is φ = 1065600.

The previous prime is 2131193. The next prime is 2131223. The reversal of 2131216 is 6121312.

It can be written as a sum of positive squares in only one way, i.e., 1971216 + 160000 = 1404^2 + 400^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 133201 = 2131216 / (2 + 1 + 3 + 1 + 2 + 1 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 2131216.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66585 + ... + 66616.

2^2131216 is an apocalyptic number.

It is an amenable number.

2131216 is a deficient number, since it is larger than the sum of its proper divisors (1998046).

2131216 is a wasteful number, since it uses less digits than its factorization.

2131216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133209 (or 133203 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 2131216 is about 1459.8684872275. The cubic root of 2131216 is about 128.6893150403.

Adding to 2131216 its reverse (6121312), we get a palindrome (8252528).

The spelling of 2131216 in words is "two million, one hundred thirty-one thousand, two hundred sixteen".