1221021112411 has 2 divisors, whose sum is σ = 1221021112412. Its totient is φ = 1221021112410.

The previous prime is 1221021112361. The next prime is 1221021112417. The reversal of 1221021112411 is 1142111201221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1142111201221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221021112411 - 2²³ = 1221012723803 is a prime.

It is a super-3 number, since 3×1221021112411³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1221021112417) 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, 610510556205 + 610510556206.

It is an arithmetic number, because the mean of its divisors is an integer number (610510556206).

Almost surely, 2^{1221021112411} is an apocalyptic number.

1221021112411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021112411 is an equidigital number, since it uses as much as digits as its factorization.

1221021112411 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 19.

Adding to 1221021112411 its reverse (1142111201221), we get a palindrome (2363132313632).

The spelling of 1221021112411 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, four hundred eleven".