421355603 has 2 divisors, whose sum is σ = 421355604. Its totient is φ = 421355602.

The previous prime is 421355573. The next prime is 421355629. The reversal of 421355603 is 306553124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421355603 - 2¹⁰ = 421354579 is a prime.

It is not a weakly prime, because it can be changed into another prime (421355633) 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, 210677801 + 210677802.

It is an arithmetic number, because the mean of its divisors is an integer number (210677802).

Almost surely, 2^421355603 is an apocalyptic number.

421355603 is a deficient number, since it is larger than the sum of its proper divisors (1).

421355603 is an equidigital number, since it uses as much as digits as its factorization.

421355603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 421355603 is about 20526.9482144814. The cubic root of 421355603 is about 749.6920827851.

The spelling of 421355603 in words is "four hundred twenty-one million, three hundred fifty-five thousand, six hundred three".