102101209 has 8 divisors (see below), whose sum is σ = 121760640. Its totient is φ = 83710176.

The previous prime is 102101191. The next prime is 102101213. The reversal of 102101209 is 902101201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102101209 - 2¹⁵ = 102068441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102101192 and 102101201.

It is not an unprimeable number, because it can be changed into a prime (102101239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316924 + ... + 317245.

It is an arithmetic number, because the mean of its divisors is an integer number (15220080).

Almost surely, 2^102101209 is an apocalyptic number.

It is an amenable number.

102101209 is a deficient number, since it is larger than the sum of its proper divisors (19659431).

102101209 is an equidigital number, since it uses as much as digits as its factorization.

102101209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634199.

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

The square root of 102101209 is about 10104.5142881783. The cubic root of 102101209 is about 467.3873582602.

The spelling of 102101209 in words is "one hundred two million, one hundred one thousand, two hundred nine".