21002003320021 has 8 divisors (see below), whose sum is σ = 21022092161280. Its totient is φ = 20981915307888.

The previous prime is 21002003320019. The next prime is 21002003320033. The reversal of 21002003320021 is 12002330020012.

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 21002003320021 - 2¹ = 21002003320019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002003319977 and 21002003320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002003320121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58366560 + ... + 58725286.

It is an arithmetic number, because the mean of its divisors is an integer number (2627761520160).

Almost surely, 2^{21002003320021} is an apocalyptic number.

It is an amenable number.

21002003320021 is a deficient number, since it is larger than the sum of its proper divisors (20088841259).

21002003320021 is a wasteful number, since it uses less digits than its factorization.

21002003320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414563.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002003320021 its reverse (12002330020012), we get a palindrome (33004333340033).

The spelling of 21002003320021 in words is "twenty-one trillion, two billion, three million, three hundred twenty thousand, twenty-one".