2211863 has 4 divisors (see below), whose sum is σ = 2243088. Its totient is φ = 2180640.

The previous prime is 2211821. The next prime is 2211883. The reversal of 2211863 is 3681122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3681122 = 2 ⋅1840561.

It is a cyclic number.

It is not a de Polignac number, because 2211863 - 2¹⁶ = 2146327 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 (2211883) 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, 15506 + ... + 15647.

It is an arithmetic number, because the mean of its divisors is an integer number (560772).

2^2211863 is an apocalyptic number.

2211863 is a deficient number, since it is larger than the sum of its proper divisors (31225).

2211863 is an equidigital number, since it uses as much as digits as its factorization.

2211863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31224.

The product of its digits is 576, while the sum is 23.

The square root of 2211863 is about 1487.2333374424. The cubic root of 2211863 is about 130.2924972125.

Adding to 2211863 its reverse (3681122), we get a palindrome (5892985).

The spelling of 2211863 in words is "two million, two hundred eleven thousand, eight hundred sixty-three".