2221212109 has 8 divisors (see below), whose sum is σ = 2301737760. Its totient is φ = 2140948656.

The previous prime is 2221212101. The next prime is 2221212113. The reversal of 2221212109 is 9012121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221212109 - 2³ = 2221212101 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 2221212109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221212101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48219 + ... + 82264.

It is an arithmetic number, because the mean of its divisors is an integer number (287717220).

Almost surely, 2^2221212109 is an apocalyptic number.

2221212109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2221212109 is a deficient number, since it is larger than the sum of its proper divisors (80525651).

2221212109 is a wasteful number, since it uses less digits than its factorization.

2221212109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131099.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2221212109 is about 47129.7369926886. The cubic root of 2221212109 is about 1304.7581274453.

The spelling of 2221212109 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, one hundred nine".