21222210112001 has 8 divisors (see below), whose sum is σ = 21767747495400. Its totient is φ = 20682047481472.

The previous prime is 21222210111941. The next prime is 21222210112013. The reversal of 21222210112001 is 10021101222212.

It can be written as a sum of positive squares in 4 ways, for example, as 5383792090000 + 15838418022001 = 2320300^2 + 3979751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222210112001 - 2²² = 21222205917697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222210112501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1343680220 + ... + 1343696013.

It is an arithmetic number, because the mean of its divisors is an integer number (2720968436925).

Almost surely, 2^{21222210112001} is an apocalyptic number.

It is an amenable number.

21222210112001 is a deficient number, since it is larger than the sum of its proper divisors (545537383399).

21222210112001 is a wasteful number, since it uses less digits than its factorization.

21222210112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687376435.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222210112001 its reverse (10021101222212), we get a palindrome (31243311334213).

The spelling of 21222210112001 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, one hundred twelve thousand, one".