221011122001 has 4 divisors (see below), whose sum is σ = 221033454004. Its totient is φ = 220988790000.

The previous prime is 221011121999. The next prime is 221011122019. The reversal of 221011122001 is 100221110122.

221011122001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 115480350976 + 105530771025 = 339824^2 + 324855^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011122001 - 2¹ = 221011121999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011122901) 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, 11151150 + ... + 11170951.

It is an arithmetic number, because the mean of its divisors is an integer number (55258363501).

Almost surely, 2^221011122001 is an apocalyptic number.

It is an amenable number.

221011122001 is a deficient number, since it is larger than the sum of its proper divisors (22332003).

221011122001 is an equidigital number, since it uses as much as digits as its factorization.

221011122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22332002.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221011122001 its reverse (100221110122), we get a palindrome (321232232123).

The spelling of 221011122001 in words is "two hundred twenty-one billion, eleven million, one hundred twenty-two thousand, one".