22921 has 2 divisors, whose sum is σ = 22922. Its totient is φ = 22920.
The previous prime is 22907. The next prime is 22937. The reversal of 22921 is 12922.
It is a happy number.
It is an a-pointer prime, because the next prime (22937) can be obtained adding 22921 to its sum of digits (16).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 19321 + 3600 = 139^2 + 60^2 .
It is a cyclic number.
It is not a de Polignac number, because 22921 - 29 = 22409 is a prime.
22921 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 22895 and 22904.
It is not a weakly prime, because it can be changed into another prime (22901) 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 as a sum of consecutive naturals, namely, 11460 + 11461.
It is an arithmetic number, because the mean of its divisors is an integer number (11461).
222921 is an apocalyptic number.
It is an amenable number.
22921 is a deficient number, since it is larger than the sum of its proper divisors (1).
22921 is an equidigital number, since it uses as much as digits as its factorization.
22921 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 72, while the sum is 16.
The square root of 22921 is about 151.3968295573. The cubic root of 22921 is about 28.4060722320.
Subtracting from 22921 its reverse (12922), we obtain a palindrome (9999).
The spelling of 22921 in words is "twenty-two thousand, nine hundred twenty-one".
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