203968421 has 4 divisors (see below), whose sum is σ = 204721344. Its totient is φ = 203215500.

The previous prime is 203968411. The next prime is 203968423. The reversal of 203968421 is 124869302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203968421 - 2²⁶ = 136859557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203968423) 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 3 ways as a sum of consecutive naturals, for example, 376055 + ... + 376596.

It is an arithmetic number, because the mean of its divisors is an integer number (51180336).

Almost surely, 2^203968421 is an apocalyptic number.

It is an amenable number.

203968421 is a deficient number, since it is larger than the sum of its proper divisors (752923).

203968421 is an equidigital number, since it uses as much as digits as its factorization.

203968421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752922.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 203968421 is about 14281.7513281810. The cubic root of 203968421 is about 588.6461546042.

The spelling of 203968421 in words is "two hundred three million, nine hundred sixty-eight thousand, four hundred twenty-one".