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22281 = 371061

22281 has 8 divisors (see below), whose sum is σ = 33984. Its totient is φ = 12720.

The previous prime is 22279. The next prime is 22283. The reversal of 22281 is 18222.

It is an interprime number because it is at equal distance from previous prime (22279) and next prime (22283).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22281 - 21 = 22279 is a prime.

It is a super-2 number, since 2×222812 = 992885922, which contains 22 as substring.

It is a Curzon number.

22281 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 22281.

It is not an unprimeable number, because it can be changed into a prime (22283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510 + ... + 551.

It is an arithmetic number, because the mean of its divisors is an integer number (4248).

222281 is an apocalyptic number.

22281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22281 is a deficient number, since it is larger than the sum of its proper divisors (11703).

22281 is a wasteful number, since it uses less digits than its factorization.

22281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071.

The product of its digits is 64, while the sum is 15.

The square root of 22281 is about 149.2682149689. The cubic root of 22281 is about 28.1391879033.

It can be divided in two parts, 222 and 81, that added together give a palindrome (303).

The spelling of 22281 in words is "twenty-two thousand, two hundred eighty-one".

Divisors: 1 3 7 21 1061 3183 7427 22281