21222111012001 has 4 divisors (see below), whose sum is σ = 21222307096900. Its totient is φ = 21221914927104.

The previous prime is 21222111011897. The next prime is 21222111012013. The reversal of 21222111012001 is 10021011122212.

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 9178330739776 + 12043780272225 = 3029576^2 + 3470415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222111012001 - 2⁷ = 21222111011873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222111012061) 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 3 ways as a sum of consecutive naturals, for example, 97880016 + ... + 98096593.

It is an arithmetic number, because the mean of its divisors is an integer number (5305576774225).

Almost surely, 2^{21222111012001} is an apocalyptic number.

It is an amenable number.

21222111012001 is a deficient number, since it is larger than the sum of its proper divisors (196084899).

21222111012001 is a wasteful number, since it uses less digits than its factorization.

21222111012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196084898.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21222111012001 its reverse (10021011122212), we get a palindrome (31243122134213).

The spelling of 21222111012001 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twelve thousand, one".