1220012021105 has 4 divisors (see below), whose sum is σ = 1464014425332. Its totient is φ = 976009616880.

The previous prime is 1220012021101. The next prime is 1220012021141. The reversal of 1220012021105 is 5011202100221.

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 819388850401 + 400623170704 = 905201^2 + 632948^2 .

It is not a de Polignac number, because 1220012021105 - 2² = 1220012021101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220012021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122001202106 + ... + 122001202115.

It is an arithmetic number, because the mean of its divisors is an integer number (366003606333).

Almost surely, 2^{1220012021105} is an apocalyptic number.

It is an amenable number.

1220012021105 is a deficient number, since it is larger than the sum of its proper divisors (244002404227).

1220012021105 is an equidigital number, since it uses as much as digits as its factorization.

1220012021105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244002404226.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 1220012021105 its reverse (5011202100221), we get a palindrome (6231214121326).

The spelling of 1220012021105 in words is "one trillion, two hundred twenty billion, twelve million, twenty-one thousand, one hundred five".