221102121211 has 4 divisors (see below), whose sum is σ = 221103112624. Its totient is φ = 221101129800.

The previous prime is 221102121187. The next prime is 221102121241. The reversal of 221102121211 is 112121201122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221102121211 - 2⁵ = 221102121179 is a prime.

It is a super-2 number, since 2×221102121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221102121241) 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 3 ways as a sum of consecutive naturals, for example, 12481 + ... + 665101.

It is an arithmetic number, because the mean of its divisors is an integer number (55275778156).

Almost surely, 2^221102121211 is an apocalyptic number.

221102121211 is a deficient number, since it is larger than the sum of its proper divisors (991413).

221102121211 is an equidigital number, since it uses as much as digits as its factorization.

221102121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991412.

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

Adding to 221102121211 its reverse (112121201122), we get a palindrome (333223322333).

The spelling of 221102121211 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred eleven".