1221020122123 has 2 divisors, whose sum is σ = 1221020122124. Its totient is φ = 1221020122122.

The previous prime is 1221020122097. The next prime is 1221020122129. The reversal of 1221020122123 is 3212210201221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221020122123 - 2⁹ = 1221020121611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221020122123.

It is not a weakly prime, because it can be changed into another prime (1221020122129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510061061 + 610510061062.

It is an arithmetic number, because the mean of its divisors is an integer number (610510061062).

Almost surely, 2^{1221020122123} is an apocalyptic number.

1221020122123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020122123 is an equidigital number, since it uses as much as digits as its factorization.

1221020122123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221020122123 its reverse (3212210201221), we get a palindrome (4433230323344).

The spelling of 1221020122123 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-three".