21222120021201 has 24 divisors (see below), whose sum is σ = 34894869287616. Its totient is φ = 12302678271840.

The previous prime is 21222120021187. The next prime is 21222120021217. The reversal of 21222120021201 is 10212002122212.

It is a happy number.

21222120021201 is a `hidden beast` number, since 21 + 2 + 221 + 200 + 21 + 201 = 666.

It is not a de Polignac number, because 21222120021201 - 2⁵ = 21222120021169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222120021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4660103130 + ... + 4660107683.

It is an arithmetic number, because the mean of its divisors is an integer number (1453952886984).

Almost surely, 2^{21222120021201} is an apocalyptic number.

It is an amenable number.

21222120021201 is a deficient number, since it is larger than the sum of its proper divisors (13672749266415).

21222120021201 is a wasteful number, since it uses less digits than its factorization.

21222120021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9320210853 (or 9320210850 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120021201 its reverse (10212002122212), we get a palindrome (31434122143413).

It can be divided in two parts, 21 and 222120021201, that added together give a palindrome (222120021222).

The spelling of 21222120021201 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, twenty-one thousand, two hundred one".