21112202000221 has 4 divisors (see below), whose sum is σ = 21116584857852. Its totient is φ = 21107819142592.

The previous prime is 21112202000191. The next prime is 21112202000237. The reversal of 21112202000221 is 12200020221112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10109945188996 + 11002256811225 = 3179614^2 + 3316965^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112202000221 - 2¹⁹ = 21112201475933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112202000195 and 21112202000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112202000291) 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, 2191421590 + ... + 2191431223.

It is an arithmetic number, because the mean of its divisors is an integer number (5279146214463).

Almost surely, 2^{21112202000221} is an apocalyptic number.

It is an amenable number.

21112202000221 is a deficient number, since it is larger than the sum of its proper divisors (4382857631).

21112202000221 is an equidigital number, since it uses as much as digits as its factorization.

21112202000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382857630.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112202000221 its reverse (12200020221112), we get a palindrome (33312222221333).

The spelling of 21112202000221 in words is "twenty-one trillion, one hundred twelve billion, two hundred two million, two hundred twenty-one", and thus it is an aban number.