21311321003 has 8 divisors (see below), whose sum is σ = 24664097280. Its totient is φ = 18035620200.

The previous prime is 21311320963. The next prime is 21311321011. The reversal of 21311321003 is 30012311312.

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 21311321003 - 2⁸ = 21311320747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311327003) 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, 19268273 + ... + 19269378.

It is an arithmetic number, because the mean of its divisors is an integer number (3083012160).

Almost surely, 2^21311321003 is an apocalyptic number.

21311321003 is a deficient number, since it is larger than the sum of its proper divisors (3352776277).

21311321003 is an equidigital number, since it uses as much as digits as its factorization.

21311321003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38537737.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21311321003 its reverse (30012311312), we get a palindrome (51323632315).

The spelling of 21311321003 in words is "twenty-one billion, three hundred eleven million, three hundred twenty-one thousand, three".