2221816 has 16 divisors (see below), whose sum is σ = 4190400. Its totient is φ = 1104384.

The previous prime is 2221789. The next prime is 2221829. The reversal of 2221816 is 6181222.

2221816 is digitally balanced in base 5, 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (261900).

2^2221816 is an apocalyptic number.

It is an amenable number.

2221816 is a deficient number, since it is larger than the sum of its proper divisors (1968584).

2221816 is a wasteful number, since it uses less digits than its factorization.

2221816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638 (or 1634 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 2221816 is about 1490.5757276972. The cubic root of 2221816 is about 130.4876360232.

The spelling of 2221816 in words is "two million, two hundred twenty-one thousand, eight hundred sixteen".