209429321 has 8 divisors (see below), whose sum is σ = 214980480. Its totient is φ = 203923888.

The previous prime is 209429309. The next prime is 209429323. The reversal of 209429321 is 123924902.

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 209429321 - 2¹⁴ = 209412937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209429323) 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, 2051 + ... + 20568.

It is an arithmetic number, because the mean of its divisors is an integer number (26872560).

Almost surely, 2^209429321 is an apocalyptic number.

It is an amenable number.

209429321 is a deficient number, since it is larger than the sum of its proper divisors (5551159).

209429321 is a wasteful number, since it uses less digits than its factorization.

209429321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22863.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 209429321 is about 14471.6730546264. The cubic root of 209429321 is about 593.8532827753.

The spelling of 209429321 in words is "two hundred nine million, four hundred twenty-nine thousand, three hundred twenty-one".