221100001101 has 24 divisors (see below), whose sum is σ = 377576359680. Its totient is φ = 121986206496.

The previous prime is 221100001091. The next prime is 221100001103. The reversal of 221100001101 is 101100001122.

It is a happy number.

It is not a de Polignac number, because 221100001101 - 2¹⁷ = 221099870029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100001103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60507205 + ... + 60510858.

It is an arithmetic number, because the mean of its divisors is an integer number (15732348320).

Almost surely, 2^221100001101 is an apocalyptic number.

221100001101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221100001101 is a deficient number, since it is larger than the sum of its proper divisors (156476358579).

221100001101 is a wasteful number, since it uses less digits than its factorization.

221100001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121018105 (or 121018102 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 221100001101 its reverse (101100001122), we get a palindrome (322200002223).

The spelling of 221100001101 in words is "two hundred twenty-one billion, one hundred million, one thousand, one hundred one".