21200110221 has 4 divisors (see below), whose sum is σ = 28266813632. Its totient is φ = 14133406812.

The previous prime is 21200110201. The next prime is 21200110223. The reversal of 21200110221 is 12201100212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21200110221 - 2⁷ = 21200110093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200110197 and 21200110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200110223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533351701 + ... + 3533351706.

It is an arithmetic number, because the mean of its divisors is an integer number (7066703408).

Almost surely, 2^21200110221 is an apocalyptic number.

It is an amenable number.

21200110221 is a deficient number, since it is larger than the sum of its proper divisors (7066703411).

21200110221 is an equidigital number, since it uses as much as digits as its factorization.

21200110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066703410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200110221 its reverse (12201100212), we get a palindrome (33401210433).

It can be divided in two parts, 212001 and 10221, that added together give a palindrome (222222).

The spelling of 21200110221 in words is "twenty-one billion, two hundred million, one hundred ten thousand, two hundred twenty-one".