2212202121209 has 4 divisors (see below), whose sum is σ = 2212284998820. Its totient is φ = 2212119243600.

The previous prime is 2212202121121. The next prime is 2212202121221. The reversal of 2212202121209 is 9021212022122.

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 58857186025 + 2153344935184 = 242605^2 + 1467428^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212202121209 - 2²⁰ = 2212201072633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212202121289) 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, 41398754 + ... + 41452155.

It is an arithmetic number, because the mean of its divisors is an integer number (553071249705).

Almost surely, 2^{2212202121209} is an apocalyptic number.

It is an amenable number.

2212202121209 is a deficient number, since it is larger than the sum of its proper divisors (82877611).

2212202121209 is an equidigital number, since it uses as much as digits as its factorization.

2212202121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82877610.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 2212202121209 in words is "two trillion, two hundred twelve billion, two hundred two million, one hundred twenty-one thousand, two hundred nine".