10101209 has 4 divisors (see below), whose sum is σ = 10540416. Its totient is φ = 9662004.

The previous prime is 10101197. The next prime is 10101227. The reversal of 10101209 is 90210101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90210101 = 8807 ⋅10243.

It is a cyclic number.

It is not a de Polignac number, because 10101209 - 2⁸ = 10100953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10101193 and 10101202.

It is not an unprimeable number, because it can be changed into a prime (10101239) 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 in 3 ways as a sum of consecutive naturals, for example, 219569 + ... + 219614.

It is an arithmetic number, because the mean of its divisors is an integer number (2635104).

Almost surely, 2^10101209 is an apocalyptic number.

It is an amenable number.

10101209 is a deficient number, since it is larger than the sum of its proper divisors (439207).

10101209 is an equidigital number, since it uses as much as digits as its factorization.

10101209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439206.

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

The square root of 10101209 is about 3178.2399217177. The cubic root of 10101209 is about 216.1678579178.

The spelling of 10101209 in words is "ten million, one hundred one thousand, two hundred nine".