8122021 has 2 divisors, whose sum is σ = 8122022.
Its totient is φ = 8122020.
The previous prime is 8122007. The next prime is 8122027. The reversal of 8122021 is 1202218.
Adding to 8122021 its reverse (1202218), we get a palindrome (9324239).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 5904900 + 2217121 = 2430^2 + 1489^2
It is a cyclic number.
It is not a de Polignac number, because 8122021 - 213 = 8113829 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 8121986 and 8122004.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (8122027) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4061010 + 4061011.
It is an arithmetic number, because the mean of its divisors is an integer number (4061011).
Almost surely, 28122021 is an apocalyptic number.
It is an amenable number.
8122021 is a deficient number, since it is larger than the sum of its proper divisors (1).
8122021 is an equidigital number, since it uses as much as digits as its factorization.
8122021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 64, while the sum is 16.
The square root of 8122021 is about 2849.9159636733.
The cubic root of 8122021 is about 201.0117151988.
The spelling of 8122021 in words is "eight million, one hundred twenty-two thousand, twenty-one".