2216421 has 12 divisors (see below), whose sum is σ = 3214848. Its totient is φ = 1471464.

The previous prime is 2216413. The next prime is 2216437. The reversal of 2216421 is 1246122.

2216421 is a `hidden beast` number, since 2 + 21 + 642 + 1 = 666.

2216421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2216421 - 2³ = 2216413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2216394 and 2216403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216471) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 3126 + ... + 3768.

It is an arithmetic number, because the mean of its divisors is an integer number (267904).

2^2216421 is an apocalyptic number.

It is an amenable number.

2216421 is a deficient number, since it is larger than the sum of its proper divisors (998427).

2216421 is a wasteful number, since it uses less digits than its factorization.

2216421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1029 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2216421 is about 1488.7649243584. The cubic root of 2216421 is about 130.3819339959.

Subtracting from 2216421 its reverse (1246122), we obtain a cube (970299 = 99³).

The spelling of 2216421 in words is "two million, two hundred sixteen thousand, four hundred twenty-one".