21201320003 has 8 divisors (see below), whose sum is σ = 21576952320. Its totient is φ = 20826593280.

The previous prime is 21201319999. The next prime is 21201320083. The reversal of 21201320003 is 30002310212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201320003 - 2² = 21201319999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201320003.

It is not an unprimeable number, because it can be changed into a prime (21201320083) 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 7 ways as a sum of consecutive naturals, for example, 179075 + ... + 272892.

It is an arithmetic number, because the mean of its divisors is an integer number (2697119040).

Almost surely, 2^21201320003 is an apocalyptic number.

21201320003 is a deficient number, since it is larger than the sum of its proper divisors (375632317).

21201320003 is an equidigital number, since it uses as much as digits as its factorization.

21201320003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452797.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21201320003 its reverse (30002310212), we get a palindrome (51203630215).

The spelling of 21201320003 in words is "twenty-one billion, two hundred one million, three hundred twenty thousand, three".