221201211109 has 32 divisors (see below), whose sum is σ = 234771812352. Its totient is φ = 208099584000.

The previous prime is 221201211079. The next prime is 221201211137. The reversal of 221201211109 is 901112102122.

It is a cyclic number.

It is not a de Polignac number, because 221201211109 - 2¹³ = 221201202917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221201211109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201211199) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216651019 + ... + 216652039.

It is an arithmetic number, because the mean of its divisors is an integer number (7336619136).

Almost surely, 2^221201211109 is an apocalyptic number.

It is an amenable number.

221201211109 is a deficient number, since it is larger than the sum of its proper divisors (13570601243).

221201211109 is a wasteful number, since it uses less digits than its factorization.

221201211109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 221201211109 in words is "two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, one hundred nine".