89021 has 2 divisors, whose sum is σ = 89022. Its totient is φ = 89020.
The previous prime is 89017. The next prime is 89041. The reversal of 89021 is 12098.
It is an a-pointer prime, because the next prime (89041) can be obtained adding 89021 to its sum of digits (20).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 81796 + 7225 = 286^2 + 85^2 .
It is a cyclic number.
It is not a de Polignac number, because 89021 - 22 = 89017 is a prime.
It is a Chen prime.
It is a plaindrome in base 16.
It is a junction number, because it is equal to n+sod(n) for n = 88984 and 89002.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (89041) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44510 + 44511.
It is an arithmetic number, because the mean of its divisors is an integer number (44511).
289021 is an apocalyptic number.
It is an amenable number.
89021 is a deficient number, since it is larger than the sum of its proper divisors (1).
89021 is an equidigital number, since it uses as much as digits as its factorization.
89021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 144, while the sum is 20.
The square root of 89021 is about 298.3638718076. The cubic root of 89021 is about 44.6509622770.
The spelling of 89021 in words is "eighty-nine thousand, twenty-one".
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