203013213421 has 4 divisors (see below), whose sum is σ = 203248455552. Its totient is φ = 202777971292.

The previous prime is 203013213413. The next prime is 203013213467. The reversal of 203013213421 is 124312310302.

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 a cyclic number.

It is not a de Polignac number, because 203013213421 - 2³ = 203013213413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203013213392 and 203013213401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203013213721) 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, 117619771 + ... + 117621496.

It is an arithmetic number, because the mean of its divisors is an integer number (50812113888).

Almost surely, 2^203013213421 is an apocalyptic number.

It is an amenable number.

203013213421 is a deficient number, since it is larger than the sum of its proper divisors (235242131).

203013213421 is an equidigital number, since it uses as much as digits as its factorization.

203013213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235242130.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 203013213421 its reverse (124312310302), we get a palindrome (327325523723).

The spelling of 203013213421 in words is "two hundred three billion, thirteen million, two hundred thirteen thousand, four hundred twenty-one".