21112221122201 has 16 divisors (see below), whose sum is σ = 24041095723008. Its totient is φ = 18352180400400.

The previous prime is 21112221122099. The next prime is 21112221122207. The reversal of 21112221122201 is 10222112221112.

It is a de Polignac number, because none of the positive numbers 2^k-21112221122201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112221122207) 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 15 ways as a sum of consecutive naturals, for example, 13514255 + ... + 14995316.

It is an arithmetic number, because the mean of its divisors is an integer number (1502568482688).

Almost surely, 2^{21112221122201} is an apocalyptic number.

It is an amenable number.

21112221122201 is a deficient number, since it is larger than the sum of its proper divisors (2928874600807).

21112221122201 is a wasteful number, since it uses less digits than its factorization.

21112221122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28512532.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112221122201 its reverse (10222112221112), we get a palindrome (31334333343313).

The spelling of 21112221122201 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred one".