109118021 has 2 divisors, whose sum is σ = 109118022. Its totient is φ = 109118020.

The previous prime is 109118011. The next prime is 109118059. The reversal of 109118021 is 120811901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61701025 + 47416996 = 7855^2 + 6886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109118021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109118011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54559010 + 54559011.

It is an arithmetic number, because the mean of its divisors is an integer number (54559011).

Almost surely, 2^109118021 is an apocalyptic number.

It is an amenable number.

109118021 is a deficient number, since it is larger than the sum of its proper divisors (1).

109118021 is an equidigital number, since it uses as much as digits as its factorization.

109118021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 109118021 is about 10445.9571605478. The cubic root of 109118021 is about 477.8579624429.

Adding to 109118021 its reverse (120811901), we get a palindrome (229929922).

The spelling of 109118021 in words is "one hundred nine million, one hundred eighteen thousand, twenty-one".