1111121123221 has 2 divisors, whose sum is σ = 1111121123222. Its totient is φ = 1111121123220.

The previous prime is 1111121123213. The next prime is 1111121123269. The reversal of 1111121123221 is 1223211211111.

It is a m-pointer prime, because the next prime (1111121123269) can be obtained adding 1111121123221 to its product of digits (48).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912481547121 + 198639576100 = 955239^2 + 445690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111121123221 - 2³ = 1111121123213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111121124221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555560561610 + 555560561611.

It is an arithmetic number, because the mean of its divisors is an integer number (555560561611).

Almost surely, 2^{1111121123221} is an apocalyptic number.

It is an amenable number.

1111121123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111121123221 is an equidigital number, since it uses as much as digits as its factorization.

1111121123221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 19.

Adding to 1111121123221 its reverse (1223211211111), we get a palindrome (2334332334332).

The spelling of 1111121123221 in words is "one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".