203044120421 has 4 divisors (see below), whose sum is σ = 203766697644. Its totient is φ = 202321543200.

The previous prime is 203044120393. The next prime is 203044120423. The reversal of 203044120421 is 124021440302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124021440302 = 2 ⋅62010720151.

It can be written as a sum of positive squares in 2 ways, for example, as 48681568321 + 154362552100 = 220639^2 + 392890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203044120421 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 (203044120423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361288190 + ... + 361288751.

It is an arithmetic number, because the mean of its divisors is an integer number (50941674411).

Almost surely, 2^203044120421 is an apocalyptic number.

It is an amenable number.

203044120421 is a deficient number, since it is larger than the sum of its proper divisors (722577223).

203044120421 is an equidigital number, since it uses as much as digits as its factorization.

203044120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722577222.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 203044120421 its reverse (124021440302), we get a palindrome (327065560723).

The spelling of 203044120421 in words is "two hundred three billion, forty-four million, one hundred twenty thousand, four hundred twenty-one".