2213561 has 4 divisors (see below), whose sum is σ = 2529792. Its totient is φ = 1897332.

The previous prime is 2213551. The next prime is 2213591. The reversal of 2213561 is 1653122.

2213561 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, and also an emirpimes, since its reverse is a distinct semiprime: 1653122 = 2 ⋅826561.

It is a cyclic number.

It is not a de Polignac number, because 2213561 - 2¹⁰ = 2212537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2213531) 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, 158105 + ... + 158118.

It is an arithmetic number, because the mean of its divisors is an integer number (632448).

2^2213561 is an apocalyptic number.

It is an amenable number.

2213561 is a deficient number, since it is larger than the sum of its proper divisors (316231).

2213561 is an equidigital number, since it uses as much as digits as its factorization.

2213561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316230.

The product of its digits is 360, while the sum is 20.

The square root of 2213561 is about 1487.8040865652. The cubic root of 2213561 is about 130.3258296072.

Adding to 2213561 its reverse (1653122), we get a palindrome (3866683).

The spelling of 2213561 in words is "two million, two hundred thirteen thousand, five hundred sixty-one".