22251 has 4 divisors (see below), whose sum is σ = 29672.
Its totient is φ = 14832.
The previous prime is 22247. The next prime is 22259. The reversal of 22251 is 15222.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 22251 - 22 = 22247 is a prime.
It is a D-number.
It is a Duffinian number.
It is a plaindrome in base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22259) 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, 3706 + ... + 3711.
It is an arithmetic number, because the mean of its divisors is an integer number (7418).
222251 is an apocalyptic number.
22251 is a deficient number, since it is larger than the sum of its proper divisors (7421).
22251 is an equidigital number, since it uses as much as digits as its factorization.
22251 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7420.
The product of its digits is 40, while the sum is 12.
The square root of 22251 is about 149.1676908717.
The cubic root of 22251 is about 28.1265530007.
Adding to 22251 its reverse (15222), we get a palindrome (37473).
The spelling of 22251 in words is "twenty-two thousand, two hundred fifty-one".