111222421 has 2 divisors, whose sum is σ = 111222422. Its totient is φ = 111222420.

The previous prime is 111222413. The next prime is 111222439. The reversal of 111222421 is 124222111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110986225 + 236196 = 10535^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222421 - 2³ = 111222413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111222395 and 111222404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111226421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611210 + 55611211.

It is an arithmetic number, because the mean of its divisors is an integer number (55611211).

Almost surely, 2^111222421 is an apocalyptic number.

It is an amenable number.

111222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222421 is an equidigital number, since it uses as much as digits as its factorization.

111222421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 16.

The square root of 111222421 is about 10546.2041038470. The cubic root of 111222421 is about 480.9103398304.

Adding to 111222421 its reverse (124222111), we get a palindrome (235444532).

The spelling of 111222421 in words is "one hundred eleven million, two hundred twenty-two thousand, four hundred twenty-one".