111222111421 has 2 divisors, whose sum is σ = 111222111422. Its totient is φ = 111222111420.

The previous prime is 111222111419. The next prime is 111222111493. The reversal of 111222111421 is 124111222111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62507000196 + 48715111225 = 250014^2 + 220715^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222111421 - 2¹ = 111222111419 is a prime.

Together with 111222111419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111222111401) 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, 55611055710 + 55611055711.

It is an arithmetic number, because the mean of its divisors is an integer number (55611055711).

Almost surely, 2^111222111421 is an apocalyptic number.

It is an amenable number.

111222111421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222111421 is an equidigital number, since it uses as much as digits as its factorization.

111222111421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 19.

Adding to 111222111421 its reverse (124111222111), we get a palindrome (235333333532).

The spelling of 111222111421 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, four hundred twenty-one".