203020312321 has 4 divisors (see below), whose sum is σ = 214962683652. Its totient is φ = 191077940992.

The previous prime is 203020312303. The next prime is 203020312409. The reversal of 203020312321 is 123213020302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80222631696 + 122797680625 = 283236^2 + 350425^2 .

It is a cyclic number.

It is not a de Polignac number, because 203020312321 - 2²⁵ = 202986757889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203020312021) 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, 5971185640 + ... + 5971185673.

It is an arithmetic number, because the mean of its divisors is an integer number (53740670913).

Almost surely, 2^203020312321 is an apocalyptic number.

It is an amenable number.

203020312321 is a deficient number, since it is larger than the sum of its proper divisors (11942371331).

203020312321 is a wasteful number, since it uses less digits than its factorization.

203020312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11942371330.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 203020312321 its reverse (123213020302), we get a palindrome (326233332623).

The spelling of 203020312321 in words is "two hundred three billion, twenty million, three hundred twelve thousand, three hundred twenty-one".