2191216 has 10 divisors (see below), whose sum is σ = 4245512. Its totient is φ = 1095600.

The previous prime is 2191199. The next prime is 2191229. The reversal of 2191216 is 6121912.

2191216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68460 + ... + 68491.

2^2191216 is an apocalyptic number.

It is an amenable number.

2191216 is a deficient number, since it is larger than the sum of its proper divisors (2054296).

2191216 is a wasteful number, since it uses less digits than its factorization.

2191216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136959 (or 136953 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 2191216 is about 1480.2756500058. The cubic root of 2191216 is about 129.8858168985.

The spelling of 2191216 in words is "two million, one hundred ninety-one thousand, two hundred sixteen".