7222021 has 2 divisors, whose sum is σ = 7222022.
Its totient is φ = 7222020.
The previous prime is 7222009. The next prime is 7222031. The reversal of 7222021 is 1202227.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 4120900 + 3101121 = 2030^2 + 1761^2
It is a cyclic number.
It is not a de Polignac number, because 7222021 - 29 = 7221509 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 7221986 and 7222004.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (7222001) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3611010 + 3611011.
It is an arithmetic number, because the mean of its divisors is an integer number (3611011).
Almost surely, 27222021 is an apocalyptic number.
It is an amenable number.
7222021 is a deficient number, since it is larger than the sum of its proper divisors (1).
7222021 is an equidigital number, since it uses as much as digits as its factorization.
7222021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 112, while the sum is 16.
The square root of 7222021 is about 2687.3818113547.
The cubic root of 7222021 is about 193.2945380606.
Adding to 7222021 its reverse (1202227), we get a palindrome (8424248).
The spelling of 7222021 in words is "seven million, two hundred twenty-two thousand, twenty-one".