203023555421 has 2 divisors, whose sum is σ = 203023555422. Its totient is φ = 203023555420.

The previous prime is 203023555409. The next prime is 203023555429. The reversal of 203023555421 is 124555320302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201848025625 + 1175529796 = 449275^2 + 34286^2 .

It is a cyclic number.

It is not a de Polignac number, because 203023555421 - 2¹⁰ = 203023554397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203023555429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101511777710 + 101511777711.

It is an arithmetic number, because the mean of its divisors is an integer number (101511777711).

Almost surely, 2^203023555421 is an apocalyptic number.

It is an amenable number.

203023555421 is a deficient number, since it is larger than the sum of its proper divisors (1).

203023555421 is an equidigital number, since it uses as much as digits as its factorization.

203023555421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 203023555421 its reverse (124555320302), we get a palindrome (327578875723).

The spelling of 203023555421 in words is "two hundred three billion, twenty-three million, five hundred fifty-five thousand, four hundred twenty-one".