2905421 has 2 divisors, whose sum is σ = 2905422. Its totient is φ = 2905420.

The previous prime is 2905417. The next prime is 2905433. The reversal of 2905421 is 1245092.

2905421 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 + 697225 = 1486^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2905421 - 2² = 2905417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2905411) 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, 1452710 + 1452711.

It is an arithmetic number, because the mean of its divisors is an integer number (1452711).

2^2905421 is an apocalyptic number.

It is an amenable number.

2905421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2905421 is an equidigital number, since it uses as much as digits as its factorization.

2905421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2905421 is about 1704.5295538652. The cubic root of 2905421 is about 142.6931166447.

The spelling of 2905421 in words is "two million, nine hundred five thousand, four hundred twenty-one".