22218361 has 4 divisors (see below), whose sum is σ = 24238224. Its totient is φ = 20198500.

The previous prime is 22218349. The next prime is 22218373. The reversal of 22218361 is 16381222.

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 an interprime number because it is at equal distance from previous prime (22218349) and next prime (22218373).

It is a cyclic number.

It is not a de Polignac number, because 22218361 - 2⁹ = 22217849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22218311) 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, 1009915 + ... + 1009936.

It is an arithmetic number, because the mean of its divisors is an integer number (6059556).

Almost surely, 2^22218361 is an apocalyptic number.

It is an amenable number.

22218361 is a deficient number, since it is larger than the sum of its proper divisors (2019863).

22218361 is a wasteful number, since it uses less digits than its factorization.

22218361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019862.

The product of its digits is 1152, while the sum is 25.

The square root of 22218361 is about 4713.6356456561. The cubic root of 22218361 is about 281.1279374193.

Adding to 22218361 its reverse (16381222), we get a palindrome (38599583).

The spelling of 22218361 in words is "twenty-two million, two hundred eighteen thousand, three hundred sixty-one".