221111100101112 has 64 divisors (see below), whose sum is σ = 595313169252480. Its totient is φ = 68032578521472.

The previous prime is 221111100101093. The next prime is 221111100101137. The reversal of 221111100101112 is 211101001111122.

It is a junction number, because it is equal to n+sod(n) for n = 221111100101091 and 221111100101100.

It is a congruent number.

It is an unprimeable number.

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, 4905703 + ... + 21593705.

It is an arithmetic number, because the mean of its divisors is an integer number (9301768269570).

Almost surely, 2^{221111100101112} is an apocalyptic number.

It is an amenable number.

221111100101112 is an abundant number, since it is smaller than the sum of its proper divisors (374202069151368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221111100101112 is a wasteful number, since it uses less digits than its factorization.

221111100101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16730492 (or 16730488 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 221111100101112 its reverse (211101001111122), we get a palindrome (432212101212234).

It can be divided in two parts, 22111110010 and 1112, that added together give a palindrome (22111111122).

The spelling of 221111100101112 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred million, one hundred one thousand, one hundred twelve".