2221653 has 16 divisors (see below), whose sum is σ = 3438080. Its totient is φ = 1249776.

The previous prime is 2221633. The next prime is 2221657. The reversal of 2221653 is 3561222.

2221653 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 2221653 - 2⁶ = 2221589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a d-powerful number, because it can be written as 2⁶ + 2¹² + 2¹⁸ + 1 + 6² + 5⁹ + 3⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221657) 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 15 ways as a sum of consecutive naturals, for example, 618 + ... + 2196.

It is an arithmetic number, because the mean of its divisors is an integer number (214880).

2^2221653 is an apocalyptic number.

It is an amenable number.

2221653 is a deficient number, since it is larger than the sum of its proper divisors (1216427).

2221653 is a wasteful number, since it uses less digits than its factorization.

2221653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

The product of its digits is 720, while the sum is 21.

The square root of 2221653 is about 1490.5210498346. The cubic root of 2221653 is about 130.4844449392.

Adding to 2221653 its reverse (3561222), we get a palindrome (5782875).

The spelling of 2221653 in words is "two million, two hundred twenty-one thousand, six hundred fifty-three".