203400001321 has 64 divisors (see below), whose sum is σ = 240267202560. Its totient is φ = 170402400000.

The previous prime is 203400001309. The next prime is 203400001331. The reversal of 203400001321 is 123100004302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 203400001321 - 2⁵ = 203400001289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203400001295 and 203400001304.

It is not an unprimeable number, because it can be changed into a prime (203400001331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 210340780 + ... + 210341746.

It is an arithmetic number, because the mean of its divisors is an integer number (3754175040).

Almost surely, 2^203400001321 is an apocalyptic number.

It is an amenable number.

203400001321 is a deficient number, since it is larger than the sum of its proper divisors (36867201239).

203400001321 is a wasteful number, since it uses less digits than its factorization.

203400001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 203400001321 its reverse (123100004302), we get a palindrome (326500005623).

The spelling of 203400001321 in words is "two hundred three billion, four hundred million, one thousand, three hundred twenty-one".