10212109 has 4 divisors (see below), whose sum is σ = 10218780. Its totient is φ = 10205440.

The previous prime is 10212077. The next prime is 10212119. The reversal of 10212109 is 90121201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90121201 = 73 ⋅1234537.

It can be written as a sum of positive squares in 2 ways, for example, as 4012009 + 6200100 = 2003^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212109 - 2⁵ = 10212077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212092 and 10212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212119) 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 in 3 ways as a sum of consecutive naturals, for example, 237 + ... + 4525.

It is an arithmetic number, because the mean of its divisors is an integer number (2554695).

Almost surely, 2^10212109 is an apocalyptic number.

It is an amenable number.

10212109 is a deficient number, since it is larger than the sum of its proper divisors (6671).

10212109 is an equidigital number, since it uses as much as digits as its factorization.

10212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 10212109 is about 3195.6390597187. The cubic root of 10212109 is about 216.9560742707.

The spelling of 10212109 in words is "ten million, two hundred twelve thousand, one hundred nine".