3421921 has 2 divisors, whose sum is σ = 3421922. Its totient is φ = 3421920.

The previous prime is 3421907. The next prime is 3421927. The reversal of 3421921 is 1291243.

3421921 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., 3381921 + 40000 = 1839^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 3421921 - 2⁷ = 3421793 is a prime.

3421921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3421892 and 3421901.

It is not a weakly prime, because it can be changed into another prime (3421927) 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, 1710960 + 1710961.

It is an arithmetic number, because the mean of its divisors is an integer number (1710961).

Almost surely, 2^3421921 is an apocalyptic number.

It is an amenable number.

3421921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3421921 is an equidigital number, since it uses as much as digits as its factorization.

3421921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 3421921 is about 1849.8435068946. The cubic root of 3421921 is about 150.6919292443.

The spelling of 3421921 in words is "three million, four hundred twenty-one thousand, nine hundred twenty-one".