21011002203321 has 36 divisors (see below), whose sum is σ = 34166599356708. Its totient is φ = 12367680190272.

The previous prime is 21011002203319. The next prime is 21011002203329. The reversal of 21011002203321 is 12330220011012.

21011002203321 is a `hidden beast` number, since 2 + 1 + 0 + 110 + 0 + 220 + 332 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11410640785296 + 9600361418025 = 3377964^2 + 3098445^2 .

It is not a de Polignac number, because 21011002203321 - 2¹ = 21011002203319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011002203294 and 21011002203303.

It is not an unprimeable number, because it can be changed into a prime (21011002203329) 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 35 ways as a sum of consecutive naturals, for example, 169674606 + ... + 169798391.

It is an arithmetic number, because the mean of its divisors is an integer number (949072204353).

Almost surely, 2^{21011002203321} is an apocalyptic number.

It is an amenable number.

21011002203321 is a deficient number, since it is larger than the sum of its proper divisors (13155597153387).

21011002203321 is a wasteful number, since it uses less digits than its factorization.

21011002203321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339473062 (or 339473036 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21011002203321 its reverse (12330220011012), we get a palindrome (33341222214333).

The spelling of 21011002203321 in words is "twenty-one trillion, eleven billion, two million, two hundred three thousand, three hundred twenty-one".