203021311032421 has 4 divisors (see below), whose sum is σ = 232024355465632. Its totient is φ = 174018266599212.

The previous prime is 203021311032403. The next prime is 203021311032439. The reversal of 203021311032421 is 124230113120302.

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 an interprime number because it is at equal distance from previous prime (203021311032403) and next prime (203021311032439).

It is not a de Polignac number, because 203021311032421 - 2⁵ = 203021311032389 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 (203021311632421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14501522216595 + ... + 14501522216608.

It is an arithmetic number, because the mean of its divisors is an integer number (58006088866408).

Almost surely, 2^{203021311032421} is an apocalyptic number.

It is an amenable number.

203021311032421 is a deficient number, since it is larger than the sum of its proper divisors (29003044433211).

203021311032421 is an equidigital number, since it uses as much as digits as its factorization.

203021311032421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29003044433210.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 203021311032421 its reverse (124230113120302), we get a palindrome (327251424152723).

The spelling of 203021311032421 in words is "two hundred three trillion, twenty-one billion, three hundred eleven million, thirty-two thousand, four hundred twenty-one".