221021221102211 has 4 divisors (see below), whose sum is σ = 221023354800624. Its totient is φ = 221019087403800.

The previous prime is 221021221102207. The next prime is 221021221102243. The reversal of 221021221102211 is 112201122120122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221021221102211 - 2² = 221021221102207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021226102211) 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, 1066693820 + ... + 1066901001.

It is an arithmetic number, because the mean of its divisors is an integer number (55255838700156).

Almost surely, 2^{221021221102211} is an apocalyptic number.

221021221102211 is a deficient number, since it is larger than the sum of its proper divisors (2133698413).

221021221102211 is a wasteful number, since it uses less digits than its factorization.

221021221102211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133698412.

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

Adding to 221021221102211 its reverse (112201122120122), we get a palindrome (333222343222333).

The spelling of 221021221102211 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred eleven".