2209421 has 2 divisors, whose sum is σ = 2209422. Its totient is φ = 2209420.

The previous prime is 2209409. The next prime is 2209447. The reversal of 2209421 is 1249022.

2209421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 1225 = 1486^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209421 - 2¹⁰ = 2208397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2209393 and 2209402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2209451) 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, 1104710 + 1104711.

It is an arithmetic number, because the mean of its divisors is an integer number (1104711).

2^2209421 is an apocalyptic number.

It is an amenable number.

2209421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2209421 is an equidigital number, since it uses as much as digits as its factorization.

2209421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2209421 is about 1486.4121232014. The cubic root of 2209421 is about 130.2445298892.

The spelling of 2209421 in words is "two million, two hundred nine thousand, four hundred twenty-one".