4905421 has 2 divisors, whose sum is σ = 4905422. Its totient is φ = 4905420.

The previous prime is 4905391. The next prime is 4905427. The reversal of 4905421 is 1245094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4888521 + 16900 = 2211^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 4905421 - 2⁵ = 4905389 is a prime.

4905421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4905427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2452710 + 2452711.

It is an arithmetic number, because the mean of its divisors is an integer number (2452711).

Almost surely, 2^4905421 is an apocalyptic number.

It is an amenable number.

4905421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4905421 is an equidigital number, since it uses as much as digits as its factorization.

4905421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 4905421 is about 2214.8185027221. The cubic root of 4905421 is about 169.9125386324.

The spelling of 4905421 in words is "four million, nine hundred five thousand, four hundred twenty-one".