221220110101111 has 16 divisors (see below), whose sum is σ = 249661624096800. Its totient is φ = 194167519436800.

The previous prime is 221220110101103. The next prime is 221220110101129. The reversal of 221220110101111 is 111101011022122.

It is a cyclic number.

It is not a de Polignac number, because 221220110101111 - 2³ = 221220110101103 is a prime.

It is a super-2 number, since 2×221220110101111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220110102111) 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 15 ways as a sum of consecutive naturals, for example, 3232870 + ... + 21281251.

It is an arithmetic number, because the mean of its divisors is an integer number (15603851506050).

Almost surely, 2^{221220110101111} is an apocalyptic number.

221220110101111 is a deficient number, since it is larger than the sum of its proper divisors (28441513995689).

221220110101111 is a wasteful number, since it uses less digits than its factorization.

221220110101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24542450.

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

Adding to 221220110101111 its reverse (111101011022122), we get a palindrome (332321121123233).

The spelling of 221220110101111 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred ten million, one hundred one thousand, one hundred eleven".