221220220111 has 4 divisors (see below), whose sum is σ = 241331149224. Its totient is φ = 201109291000.

The previous prime is 221220220073. The next prime is 221220220121. The reversal of 221220220111 is 111022022122.

It is a happy number.

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 221220220111 - 2⁹ = 221220219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220220121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10055464540 + ... + 10055464561.

It is an arithmetic number, because the mean of its divisors is an integer number (60332787306).

Almost surely, 2^221220220111 is an apocalyptic number.

221220220111 is a deficient number, since it is larger than the sum of its proper divisors (20110929113).

221220220111 is a wasteful number, since it uses less digits than its factorization.

221220220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20110929112.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221220220111 its reverse (111022022122), we get a palindrome (332242242233).

The spelling of 221220220111 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, one hundred eleven".