221220211109 has 4 divisors (see below), whose sum is σ = 221264363040. Its totient is φ = 221176059180.

The previous prime is 221220211063. The next prime is 221220211153. The reversal of 221220211109 is 901112022122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221220211109 - 2³² = 216925243813 is a prime.

It is a super-2 number, since 2×221220211109² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220231109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22068449 + ... + 22078470.

It is an arithmetic number, because the mean of its divisors is an integer number (55316090760).

Almost surely, 2^221220211109 is an apocalyptic number.

It is an amenable number.

221220211109 is a deficient number, since it is larger than the sum of its proper divisors (44151931).

221220211109 is an equidigital number, since it uses as much as digits as its factorization.

221220211109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44151930.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 221220211109 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, one hundred nine".