2290021 has 2 divisors, whose sum is σ = 2290022. Its totient is φ = 2290020.

The previous prime is 2290007. The next prime is 2290031. The reversal of 2290021 is 1200922.

It is a happy number.

2290021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 72900 = 1489^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2290021 - 2¹¹ = 2287973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2289977 and 2290004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2290031) 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, 1145010 + 1145011.

It is an arithmetic number, because the mean of its divisors is an integer number (1145011).

2^2290021 is an apocalyptic number.

It is an amenable number.

2290021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2290021 is an equidigital number, since it uses as much as digits as its factorization.

2290021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2290021 is about 1513.2815336216. The cubic root of 2290021 is about 131.8094319274.

Adding to 2290021 its reverse (1200922), we get a palindrome (3490943).

The spelling of 2290021 in words is "two million, two hundred ninety thousand, twenty-one".