2221121112109 has 4 divisors (see below), whose sum is σ = 2221248831516. Its totient is φ = 2220993392704.

The previous prime is 2221121111981. The next prime is 2221121112113. The reversal of 2221121112109 is 9012111211222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160202464009 + 2060918648100 = 400253^2 + 1435590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221121112109 - 2⁷ = 2221121111981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221121112169) 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, 63833614 + ... + 63868399.

It is an arithmetic number, because the mean of its divisors is an integer number (555312207879).

Almost surely, 2^{2221121112109} is an apocalyptic number.

It is an amenable number.

2221121112109 is a deficient number, since it is larger than the sum of its proper divisors (127719407).

2221121112109 is a wasteful number, since it uses less digits than its factorization.

2221121112109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127719406.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 2221121112109 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred nine".