21331312003 has 4 divisors (see below), whose sum is σ = 22586095080. Its totient is φ = 20076528928.

The previous prime is 21331311977. The next prime is 21331312019. The reversal of 21331312003 is 30021313312.

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 21331312003 - 2⁵ = 21331311971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331312903) 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, 627391513 + ... + 627391546.

It is an arithmetic number, because the mean of its divisors is an integer number (5646523770).

Almost surely, 2^21331312003 is an apocalyptic number.

21331312003 is a deficient number, since it is larger than the sum of its proper divisors (1254783077).

21331312003 is a wasteful number, since it uses less digits than its factorization.

21331312003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254783076.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21331312003 its reverse (30021313312), we get a palindrome (51352625315).

The spelling of 21331312003 in words is "twenty-one billion, three hundred thirty-one million, three hundred twelve thousand, three".