203012321 has 6 divisors (see below), whose sum is σ = 214259922. Its totient is φ = 192327120.

The previous prime is 203012311. The next prime is 203012347. The reversal of 203012321 is 123210302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 176890000 + 26122321 = 13300^2 + 5111^2 .

It is not a de Polignac number, because 203012321 - 2²² = 198818017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203012296 and 203012305.

It is not an unprimeable number, because it can be changed into a prime (203012311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280820 + ... + 281541.

It is an arithmetic number, because the mean of its divisors is an integer number (35709987).

Almost surely, 2^203012321 is an apocalyptic number.

It is an amenable number.

203012321 is a deficient number, since it is larger than the sum of its proper divisors (11247601).

203012321 is an equidigital number, since it uses as much as digits as its factorization.

203012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562399 (or 562380 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 203012321 is about 14248.2392245498. The cubic root of 203012321 is about 587.7249560133.

Adding to 203012321 its reverse (123210302), we get a palindrome (326222623).

It can be divided in two parts, 20301 and 2321, that added together give a palindrome (22622).

The spelling of 203012321 in words is "two hundred three million, twelve thousand, three hundred twenty-one".