21021203331013 has 8 divisors (see below), whose sum is σ = 21028604244120. Its totient is φ = 21013802772480.

The previous prime is 21021203330971. The next prime is 21021203331019. The reversal of 21021203331013 is 31013330212012.

It can be written as a sum of positive squares in 4 ways, for example, as 17862059680609 + 3159143650404 = 4226353^2 + 1777398^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021203331013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021203331019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184389693 + ... + 184503661.

It is an arithmetic number, because the mean of its divisors is an integer number (2628575530515).

Almost surely, 2^{21021203331013} is an apocalyptic number.

It is an amenable number.

21021203331013 is a deficient number, since it is larger than the sum of its proper divisors (7400913107).

21021203331013 is a wasteful number, since it uses less digits than its factorization.

21021203331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177287.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21021203331013 its reverse (31013330212012), we get a palindrome (52034533543025).

The spelling of 21021203331013 in words is "twenty-one trillion, twenty-one billion, two hundred three million, three hundred thirty-one thousand, thirteen".