21201110210221 has 8 divisors (see below), whose sum is σ = 22450456459584. Its totient is φ = 19952010863040.

The previous prime is 21201110210213. The next prime is 21201110210233. The reversal of 21201110210221 is 12201201110212.

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 21201110210221 - 2³ = 21201110210213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201110210195 and 21201110210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201110210261) 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 7 ways as a sum of consecutive naturals, for example, 61548735 + ... + 61892236.

It is an arithmetic number, because the mean of its divisors is an integer number (2806307057448).

Almost surely, 2^{21201110210221} is an apocalyptic number.

It is an amenable number.

21201110210221 is a deficient number, since it is larger than the sum of its proper divisors (1249346249363).

21201110210221 is a wasteful number, since it uses less digits than its factorization.

21201110210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123451091.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201110210221 its reverse (12201201110212), we get a palindrome (33402311320433).

The spelling of 21201110210221 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred ten thousand, two hundred twenty-one".