203423121421 has 12 divisors (see below), whose sum is σ = 222295630260. Its totient is φ = 186052464000.

The previous prime is 203423121413. The next prime is 203423121457. The reversal of 203423121421 is 124121324302.

203423121421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 28208882025 + 175214239396 = 167955^2 + 418586^2 .

It is not a de Polignac number, because 203423121421 - 2³ = 203423121413 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 (203423127421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5503080 + ... + 5539921.

It is an arithmetic number, because the mean of its divisors is an integer number (18524635855).

Almost surely, 2^203423121421 is an apocalyptic number.

It is an amenable number.

203423121421 is a deficient number, since it is larger than the sum of its proper divisors (18872508839).

203423121421 is a wasteful number, since it uses less digits than its factorization.

203423121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043136 (or 11043123 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 203423121421 its reverse (124121324302), we get a palindrome (327544445723).

The spelling of 203423121421 in words is "two hundred three billion, four hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty-one".