100000021109 has 2 divisors, whose sum is σ = 100000021110. Its totient is φ = 100000021108.

The previous prime is 100000021091. The next prime is 100000021157. The reversal of 100000021109 is 901120000001.

Together with previous prime (100000021091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89646348100 + 10353673009 = 299410^2 + 101753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000021109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100000021093 and 100000021102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100000021909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000010554 + 50000010555.

It is an arithmetic number, because the mean of its divisors is an integer number (50000010555).

Almost surely, 2^100000021109 is an apocalyptic number.

It is an amenable number.

100000021109 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000021109 is an equidigital number, since it uses as much as digits as its factorization.

100000021109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 100000021109 in words is "one hundred billion, twenty-one thousand, one hundred nine".