203663421 has 36 divisors (see below), whose sum is σ = 320337108. Its totient is φ = 124630272.

The previous prime is 203663407. The next prime is 203663477. The reversal of 203663421 is 124366302.

203663421 is a `hidden beast` number, since 2 + 0 + 3 + 6 + 634 + 21 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1625625 + 202037796 = 1275^2 + 14214^2 .

It is not a de Polignac number, because 203663421 - 2⁵ = 203663389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203663401) 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 in 35 ways as a sum of consecutive naturals, for example, 445425 + ... + 445881.

It is an arithmetic number, because the mean of its divisors is an integer number (8898253).

Almost surely, 2^203663421 is an apocalyptic number.

It is an amenable number.

203663421 is a deficient number, since it is larger than the sum of its proper divisors (116673687).

203663421 is a wasteful number, since it uses less digits than its factorization.

203663421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 203663421 is about 14271.0693712840. The cubic root of 203663421 is about 588.3526015798.

The spelling of 203663421 in words is "two hundred three million, six hundred sixty-three thousand, four hundred twenty-one".