21303203322403 has 4 divisors (see below), whose sum is σ = 21303486598288. Its totient is φ = 21302920046520.

The previous prime is 21303203322389. The next prime is 21303203322563. The reversal of 21303203322403 is 30422330230312.

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 21303203322403 - 2¹⁷ = 21303203191331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303203322103) 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, 141525108 + ... + 141675553.

It is an arithmetic number, because the mean of its divisors is an integer number (5325871649572).

Almost surely, 2^{21303203322403} is an apocalyptic number.

21303203322403 is a deficient number, since it is larger than the sum of its proper divisors (283275885).

21303203322403 is an equidigital number, since it uses as much as digits as its factorization.

21303203322403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283275884.

The product of its (nonzero) digits is 15552, while the sum is 28.

Adding to 21303203322403 its reverse (30422330230312), we get a palindrome (51725533552715).

The spelling of 21303203322403 in words is "twenty-one trillion, three hundred three billion, two hundred three million, three hundred twenty-two thousand, four hundred three".