21300020003 has 4 divisors (see below), whose sum is σ = 21819532728. Its totient is φ = 20780507280.

The previous prime is 21300019999. The next prime is 21300020009. The reversal of 21300020003 is 30002000312.

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 21300020003 - 2² = 21300019999 is a prime.

It is a super-3 number, since 3×21300020003³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300020009) 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, 259756301 + ... + 259756382.

It is an arithmetic number, because the mean of its divisors is an integer number (5454883182).

Almost surely, 2^21300020003 is an apocalyptic number.

21300020003 is a deficient number, since it is larger than the sum of its proper divisors (519512725).

21300020003 is an equidigital number, since it uses as much as digits as its factorization.

21300020003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519512724.

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 21300020003 its reverse (30002000312), we get a palindrome (51302020315).

The spelling of 21300020003 in words is "twenty-one billion, three hundred million, twenty thousand, three".