1222121221109 has 4 divisors (see below), whose sum is σ = 1222158273516. Its totient is φ = 1222084168704.

The previous prime is 1222121221103. The next prime is 1222121221133. The reversal of 1222121221109 is 9011221212221.

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 383257570084 + 838863651025 = 619078^2 + 915895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222121221109 - 2⁴⁰ = 122609593333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222121221103) 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, 18476684 + ... + 18542709.

It is an arithmetic number, because the mean of its divisors is an integer number (305539568379).

Almost surely, 2^{1222121221109} is an apocalyptic number.

It is an amenable number.

1222121221109 is a deficient number, since it is larger than the sum of its proper divisors (37052407).

1222121221109 is an equidigital number, since it uses as much as digits as its factorization.

1222121221109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37052406.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1222121221109 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred nine".