221201201109 has 16 divisors (see below), whose sum is σ = 338814972032. Its totient is φ = 125745758208.

The previous prime is 221201201099. The next prime is 221201201113. The reversal of 221201201109 is 901102102122.

It is not a de Polignac number, because 221201201109 - 2¹¹ = 221201199061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201201509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27284524 + ... + 27292629.

It is an arithmetic number, because the mean of its divisors is an integer number (21175935752).

Almost surely, 2^221201201109 is an apocalyptic number.

It is an amenable number.

221201201109 is a deficient number, since it is larger than the sum of its proper divisors (117613770923).

221201201109 is a wasteful number, since it uses less digits than its factorization.

221201201109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54577356.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 221201201109 in words is "two hundred twenty-one billion, two hundred one million, two hundred one thousand, one hundred nine".