203043402451421 has 16 divisors (see below), whose sum is σ = 242142534376704. Its totient is φ = 166467742070784.

The previous prime is 203043402451391. The next prime is 203043402451423. The reversal of 203043402451421 is 124154204340302.

It is not a de Polignac number, because 203043402451421 - 2³⁸ = 202768524544477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203043402451423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330371 + ... + 20154303.

It is an arithmetic number, because the mean of its divisors is an integer number (15133908398544).

Almost surely, 2^{203043402451421} is an apocalyptic number.

It is an amenable number.

203043402451421 is a deficient number, since it is larger than the sum of its proper divisors (39099131925283).

203043402451421 is a wasteful number, since it uses less digits than its factorization.

203043402451421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19887580.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 203043402451421 its reverse (124154204340302), we get a palindrome (327197606791723).

The spelling of 203043402451421 in words is "two hundred three trillion, forty-three billion, four hundred two million, four hundred fifty-one thousand, four hundred twenty-one".