221220020111 has 4 divisors (see below), whose sum is σ = 228356149824. Its totient is φ = 214083890400.

The previous prime is 221220020083. The next prime is 221220020117. The reversal of 221220020111 is 111020022122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111020022122 = 2 ⋅55510011061.

It is a cyclic number.

It is not a de Polignac number, because 221220020111 - 2¹⁰ = 221220019087 is a prime.

It is a super-3 number, since 3×221220020111³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220020117) 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, 3568064810 + ... + 3568064871.

It is an arithmetic number, because the mean of its divisors is an integer number (57089037456).

Almost surely, 2^221220020111 is an apocalyptic number.

221220020111 is a deficient number, since it is larger than the sum of its proper divisors (7136129713).

221220020111 is an equidigital number, since it uses as much as digits as its factorization.

221220020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136129712.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221220020111 its reverse (111020022122), we get a palindrome (332240042233).

The spelling of 221220020111 in words is "two hundred twenty-one billion, two hundred twenty million, twenty thousand, one hundred eleven".