2208421 has 2 divisors, whose sum is σ = 2208422. Its totient is φ = 2208420.

The previous prime is 2208413. The next prime is 2208431. The reversal of 2208421 is 1248022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 225 = 1486^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 2208421 - 2³ = 2208413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2208431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1104210 + 1104211.

It is an arithmetic number, because the mean of its divisors is an integer number (1104211).

2^2208421 is an apocalyptic number.

It is an amenable number.

2208421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2208421 is an equidigital number, since it uses as much as digits as its factorization.

2208421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2208421 is about 1486.0757046665. The cubic root of 2208421 is about 130.2248770503.

The spelling of 2208421 in words is "two million, two hundred eight thousand, four hundred twenty-one".