21003312001 has 8 divisors (see below), whose sum is σ = 24410629440. Its totient is φ = 17697705648.

The previous prime is 21003311981. The next prime is 21003312007. The reversal of 21003312001 is 10021330012.

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

It is not a de Polignac number, because 21003312001 - 2³¹ = 18855828353 is a prime.

It is a super-2 number, since 2×21003312001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003312007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25427326 + ... + 25428151.

It is an arithmetic number, because the mean of its divisors is an integer number (3051328680).

Almost surely, 2^21003312001 is an apocalyptic number.

It is an amenable number.

21003312001 is a deficient number, since it is larger than the sum of its proper divisors (3407317439).

21003312001 is an equidigital number, since it uses as much as digits as its factorization.

21003312001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50855543.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21003312001 its reverse (10021330012), we get a palindrome (31024642013).

The spelling of 21003312001 in words is "twenty-one billion, three million, three hundred twelve thousand, one".