1220120122121 has 2 divisors, whose sum is σ = 1220120122122. Its totient is φ = 1220120122120.

The previous prime is 1220120122043. The next prime is 1220120122171. The reversal of 1220120122121 is 1212210210221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220096976400 + 23145721 = 1104580^2 + 4811^2 .

It is an emirp because it is prime and its reverse (1212210210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220120122121 - 2¹⁰ = 1220120121097 is a prime.

It is a super-2 number, since 2×1220120122121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220120122121.

It is not a weakly prime, because it can be changed into another prime (1220120122171) 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 as a sum of consecutive naturals, namely, 610060061060 + 610060061061.

It is an arithmetic number, because the mean of its divisors is an integer number (610060061061).

Almost surely, 2^{1220120122121} is an apocalyptic number.

It is an amenable number.

1220120122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220120122121 is an equidigital number, since it uses as much as digits as its factorization.

1220120122121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1220120122121 its reverse (1212210210221), we get a palindrome (2432330332342).

The spelling of 1220120122121 in words is "one trillion, two hundred twenty billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".