2213261 has 4 divisors (see below), whose sum is σ = 2218524. Its totient is φ = 2208000.

The previous prime is 2213243. The next prime is 2213279. The reversal of 2213261 is 1623122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1623122 = 2 ⋅811561.

It is an interprime number because it is at equal distance from previous prime (2213243) and next prime (2213279).

It can be written as a sum of positive squares in 2 ways, for example, as 990025 + 1223236 = 995^2 + 1106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2213261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940 + ... + 2861.

It is an arithmetic number, because the mean of its divisors is an integer number (554631).

2^2213261 is an apocalyptic number.

It is an amenable number.

2213261 is a deficient number, since it is larger than the sum of its proper divisors (5263).

2213261 is an equidigital number, since it uses as much as digits as its factorization.

2213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262.

The product of its digits is 144, while the sum is 17.

The square root of 2213261 is about 1487.7032634232. The cubic root of 2213261 is about 130.3199417316.

Adding to 2213261 its reverse (1623122), we get a palindrome (3836383).

The spelling of 2213261 in words is "two million, two hundred thirteen thousand, two hundred sixty-one".