21222120122201 has 4 divisors (see below), whose sum is σ = 21906704642304. Its totient is φ = 20537535602100.

The previous prime is 21222120122129. The next prime is 21222120122209. The reversal of 21222120122201 is 10222102122212.

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 a cyclic number.

It is not a de Polignac number, because 21222120122201 - 2¹⁰ = 21222120121177 is a prime.

It is a super-2 number, since 2×21222120122201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222120122209) 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, 342292260005 + ... + 342292260066.

It is an arithmetic number, because the mean of its divisors is an integer number (5476676160576).

Almost surely, 2^{21222120122201} is an apocalyptic number.

It is an amenable number.

21222120122201 is a deficient number, since it is larger than the sum of its proper divisors (684584520103).

21222120122201 is an equidigital number, since it uses as much as digits as its factorization.

21222120122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684584520102.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222120122201 its reverse (10222102122212), we get a palindrome (31444222244413).

The spelling of 21222120122201 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty-two thousand, two hundred one".