2216621 has 4 divisors (see below), whose sum is σ = 2418144. Its totient is φ = 2015100.

The previous prime is 2216611. The next prime is 2216629. The reversal of 2216621 is 1266122.

It is a happy number.

2216621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2216621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2216593 and 2216602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216629) 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 3 ways as a sum of consecutive naturals, for example, 100745 + ... + 100766.

It is an arithmetic number, because the mean of its divisors is an integer number (604536).

2^2216621 is an apocalyptic number.

It is an amenable number.

2216621 is a deficient number, since it is larger than the sum of its proper divisors (201523).

2216621 is a wasteful number, since it uses less digits than its factorization.

2216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201522.

The product of its digits is 288, while the sum is 20.

The square root of 2216621 is about 1488.8320926149. The cubic root of 2216621 is about 130.3858555737.

The spelling of 2216621 in words is "two million, two hundred sixteen thousand, six hundred twenty-one".