221102109 has 8 divisors (see below), whose sum is σ = 327558720. Its totient is φ = 147401388.

The previous prime is 221102099. The next prime is 221102113. The reversal of 221102109 is 901201122.

It is not a de Polignac number, because 221102109 - 2⁴ = 221102093 is a prime.

It is a super-2 number, since 2×221102109² = 97772285208495762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221102091 and 221102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221182109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4094457 + ... + 4094510.

It is an arithmetic number, because the mean of its divisors is an integer number (40944840).

Almost surely, 2^221102109 is an apocalyptic number.

It is an amenable number.

221102109 is a deficient number, since it is larger than the sum of its proper divisors (106456611).

221102109 is an equidigital number, since it uses as much as digits as its factorization.

221102109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8188976 (or 8188970 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 221102109 is about 14869.5026480377. The cubic root of 221102109 is about 604.6874591791.

The spelling of 221102109 in words is "two hundred twenty-one million, one hundred two thousand, one hundred nine".