1211220012122 has 4 divisors (see below), whose sum is σ = 1816830018186. Its totient is φ = 605610006060.

The previous prime is 1211220012103. The next prime is 1211220012131. The reversal of 1211220012122 is 2212100221121.

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

It can be written as a sum of positive squares in only one way, i.e., 1175838778321 + 35381233801 = 1084361^2 + 188099^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211220012122.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 302805003029 + ... + 302805003032.

Almost surely, 2^{1211220012122} is an apocalyptic number.

1211220012122 is a deficient number, since it is larger than the sum of its proper divisors (605610006064).

1211220012122 is an equidigital number, since it uses as much as digits as its factorization.

1211220012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605610006063.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211220012122 its reverse (2212100221121), we get a palindrome (3423320233243).

The spelling of 1211220012122 in words is "one trillion, two hundred eleven billion, two hundred twenty million, twelve thousand, one hundred twenty-two".