21303332403 has 4 divisors (see below), whose sum is σ = 28404443208. Its totient is φ = 14202221600.

The previous prime is 21303332387. The next prime is 21303332461. The reversal of 21303332403 is 30423330312.

It is a happy number.

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 21303332403 - 2⁴ = 21303332387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303332503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550555398 + ... + 3550555403.

It is an arithmetic number, because the mean of its divisors is an integer number (7101110802).

Almost surely, 2^21303332403 is an apocalyptic number.

21303332403 is a deficient number, since it is larger than the sum of its proper divisors (7101110805).

21303332403 is an equidigital number, since it uses as much as digits as its factorization.

21303332403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7101110804.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21303332403 its reverse (30423330312), we get a palindrome (51726662715).

The spelling of 21303332403 in words is "twenty-one billion, three hundred three million, three hundred thirty-two thousand, four hundred three".