22005261 has 6 divisors (see below), whose sum is σ = 31785390. Its totient is φ = 14670168.

The previous prime is 22005241. The next prime is 22005271. The reversal of 22005261 is 16250022.

It can be written as a sum of positive squares in only one way, i.e., 21206025 + 799236 = 4605^2 + 894^2 .

It is not a de Polignac number, because 22005261 - 2¹⁰ = 22004237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1222506 + ... + 1222523.

It is an arithmetic number, because the mean of its divisors is an integer number (5297565).

Almost surely, 2^22005261 is an apocalyptic number.

It is an amenable number.

22005261 is a deficient number, since it is larger than the sum of its proper divisors (9780129).

22005261 is a wasteful number, since it uses less digits than its factorization.

22005261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445035 (or 2445032 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22005261 is about 4690.9765507834. The cubic root of 22005261 is about 280.2262669352.

Adding to 22005261 its reverse (16250022), we get a palindrome (38255283).

The spelling of 22005261 in words is "twenty-two million, five thousand, two hundred sixty-one".