21201101010221 has 8 divisors (see below), whose sum is σ = 23128507634304. Its totient is φ = 19273700020320.

The previous prime is 21201101010217. The next prime is 21201101010247. The reversal of 21201101010221 is 12201010110212.

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 21201101010221 - 2² = 21201101010217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201101010196 and 21201101010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201101010121) 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, 12053441 + ... + 13699913.

It is an arithmetic number, because the mean of its divisors is an integer number (2891063454288).

Almost surely, 2^{21201101010221} is an apocalyptic number.

It is an amenable number.

21201101010221 is a deficient number, since it is larger than the sum of its proper divisors (1927406624083).

21201101010221 is a wasteful number, since it uses less digits than its factorization.

21201101010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817091.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201101010221 its reverse (12201010110212), we get a palindrome (33402111120433).

Subtracting from 21201101010221 its reverse (12201010110212), we obtain a palindrome (9000090900009).

The spelling of 21201101010221 in words is "twenty-one trillion, two hundred one billion, one hundred one million, ten thousand, two hundred twenty-one".