203320021231 has 4 divisors (see below), whose sum is σ = 214021075000. Its totient is φ = 192618967464.

The previous prime is 203320021213. The next prime is 203320021243. The reversal of 203320021231 is 132120023302.

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

It is a cyclic number.

It is not a de Polignac number, because 203320021231 - 2⁷ = 203320021103 is a prime.

It is a super-2 number, since 2×203320021231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 10701053749 = 203320021231 / (2 + 0 + 3 + 3 + 2 + 0 + 0 + 2 + 1 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203320021199 and 203320021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203320021211) 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, 5350526856 + ... + 5350526893.

It is an arithmetic number, because the mean of its divisors is an integer number (53505268750).

Almost surely, 2^203320021231 is an apocalyptic number.

203320021231 is a deficient number, since it is larger than the sum of its proper divisors (10701053769).

203320021231 is a wasteful number, since it uses less digits than its factorization.

203320021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10701053768.

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

Adding to 203320021231 its reverse (132120023302), we get a palindrome (335440044533).

The spelling of 203320021231 in words is "two hundred three billion, three hundred twenty million, twenty-one thousand, two hundred thirty-one".