109243021 has 2 divisors, whose sum is σ = 109243022. Its totient is φ = 109243020.

The previous prime is 109243007. The next prime is 109243033. The reversal of 109243021 is 120342901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58690921 + 50552100 = 7661^2 + 7110^2 .

It is a cyclic number.

It is not a de Polignac number, because 109243021 - 2¹⁹ = 108718733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 109242983 and 109243001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109243051) 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, 54621510 + 54621511.

It is an arithmetic number, because the mean of its divisors is an integer number (54621511).

Almost surely, 2^109243021 is an apocalyptic number.

It is an amenable number.

109243021 is a deficient number, since it is larger than the sum of its proper divisors (1).

109243021 is an equidigital number, since it uses as much as digits as its factorization.

109243021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 109243021 is about 10451.9386240066. The cubic root of 109243021 is about 478.0403626567.

Adding to 109243021 its reverse (120342901), we get a palindrome (229585922).

The spelling of 109243021 in words is "one hundred nine million, two hundred forty-three thousand, twenty-one".