109318021 has 2 divisors, whose sum is σ = 109318022. Its totient is φ = 109318020.

The previous prime is 109318009. The next prime is 109318031. The reversal of 109318021 is 120813901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 45077796 = 8015^2 + 6714^2 .

It is a cyclic number.

It is not a de Polignac number, because 109318021 - 2⁷ = 109317893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109318031) 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, 54659010 + 54659011.

It is an arithmetic number, because the mean of its divisors is an integer number (54659011).

Almost surely, 2^109318021 is an apocalyptic number.

It is an amenable number.

109318021 is a deficient number, since it is larger than the sum of its proper divisors (1).

109318021 is an equidigital number, since it uses as much as digits as its factorization.

109318021 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 25.

The square root of 109318021 is about 10455.5258595634. The cubic root of 109318021 is about 478.1497360065.

The spelling of 109318021 in words is "one hundred nine million, three hundred eighteen thousand, twenty-one".