209212147 has 8 divisors (see below), whose sum is σ = 213690960. Its totient is φ = 204753120.

The previous prime is 209212121. The next prime is 209212231. The reversal of 209212147 is 741212902.

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 209212147 - 2⁷ = 209212019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209212247) 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, 17497 + ... + 26917.

It is an arithmetic number, because the mean of its divisors is an integer number (26711370).

Almost surely, 2^209212147 is an apocalyptic number.

209212147 is a deficient number, since it is larger than the sum of its proper divisors (4478813).

209212147 is an equidigital number, since it uses as much as digits as its factorization.

209212147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9893.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 209212147 is about 14464.1676912292. The cubic root of 209212147 is about 593.6479404709.

The spelling of 209212147 in words is "two hundred nine million, two hundred twelve thousand, one hundred forty-seven".