111223621 has 2 divisors, whose sum is σ = 111223622. Its totient is φ = 111223620.

The previous prime is 111223589. The next prime is 111223631. The reversal of 111223621 is 126322111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108451396 + 2772225 = 10414^2 + 1665^2 .

It is a cyclic number.

It is not a de Polignac number, because 111223621 - 2⁵ = 111223589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111223631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611810 + 55611811.

It is an arithmetic number, because the mean of its divisors is an integer number (55611811).

Almost surely, 2^111223621 is an apocalyptic number.

It is an amenable number.

111223621 is a deficient number, since it is larger than the sum of its proper divisors (1).

111223621 is an equidigital number, since it uses as much as digits as its factorization.

111223621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 111223621 is about 10546.2609962014. The cubic root of 111223621 is about 480.9120693688.

Adding to 111223621 its reverse (126322111), we get a palindrome (237545732).

The spelling of 111223621 in words is "one hundred eleven million, two hundred twenty-three thousand, six hundred twenty-one".