21201200010221 has 16 divisors (see below), whose sum is σ = 26972107094400. Its totient is φ = 16520415589440.

The previous prime is 21201200010173. The next prime is 21201200010233. The reversal of 21201200010221 is 12201000210212.

It is not a de Polignac number, because 21201200010221 - 2³⁰ = 21200126268397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201200010196 and 21201200010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201200010251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2809590716 + ... + 2809598261.

It is an arithmetic number, because the mean of its divisors is an integer number (1685756693400).

Almost surely, 2^{21201200010221} is an apocalyptic number.

It is an amenable number.

21201200010221 is a deficient number, since it is larger than the sum of its proper divisors (5770907084179).

21201200010221 is an equidigital number, since it uses as much as digits as its factorization.

21201200010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619189009 (or 5619188995 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201200010221 its reverse (12201000210212), we get a palindrome (33402200220433).

The spelling of 21201200010221 in words is "twenty-one trillion, two hundred one billion, two hundred million, ten thousand, two hundred twenty-one".