2821421 has 2 divisors, whose sum is σ = 2821422. Its totient is φ = 2821420.

The previous prime is 2821411. The next prime is 2821451. The reversal of 2821421 is 1241282.

It is a happy number.

2821421 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., 2758921 + 62500 = 1661^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2821421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2821393 and 2821402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2821411) 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, 1410710 + 1410711.

It is an arithmetic number, because the mean of its divisors is an integer number (1410711).

2^2821421 is an apocalyptic number.

It is an amenable number.

2821421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821421 is an equidigital number, since it uses as much as digits as its factorization.

2821421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 20.

The square root of 2821421 is about 1679.7086056814. The cubic root of 2821421 is about 141.3044909451.

The spelling of 2821421 in words is "two million, eight hundred twenty-one thousand, four hundred twenty-one".