21201110200221 has 32 divisors (see below), whose sum is σ = 32364388546560. Its totient is φ = 12093198234816.

The previous prime is 21201110200211. The next prime is 21201110200229. The reversal of 21201110200221 is 12200201110212.

It is not a de Polignac number, because 21201110200221 - 2⁷ = 21201110200093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201110200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201110200229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149319955 + ... + 149461871.

It is an arithmetic number, because the mean of its divisors is an integer number (1011387142080).

Almost surely, 2^{21201110200221} is an apocalyptic number.

21201110200221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21201110200221 is a deficient number, since it is larger than the sum of its proper divisors (11163278346339).

21201110200221 is a wasteful number, since it uses less digits than its factorization.

21201110200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154633.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201110200221 its reverse (12200201110212), we get a palindrome (33401311310433).

Subtracting from 21201110200221 its reverse (12200201110212), we obtain a palindrome (9000909090009).

The spelling of 21201110200221 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred thousand, two hundred twenty-one".