111152221 has 2 divisors, whose sum is σ = 111152222. Its totient is φ = 111152220.

The previous prime is 111152219. The next prime is 111152233. The reversal of 111152221 is 122251111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97239321 + 13912900 = 9861^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 111152221 - 2¹ = 111152219 is a prime.

Together with 111152219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 111152195 and 111152204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111152201) 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, 55576110 + 55576111.

It is an arithmetic number, because the mean of its divisors is an integer number (55576111).

Almost surely, 2^111152221 is an apocalyptic number.

It is an amenable number.

111152221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111152221 is an equidigital number, since it uses as much as digits as its factorization.

111152221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40, while the sum is 16.

The square root of 111152221 is about 10542.8753668058. The cubic root of 111152221 is about 480.8091401779.

The spelling of 111152221 in words is "one hundred eleven million, one hundred fifty-two thousand, two hundred twenty-one".