213209806 has 8 divisors (see below), whose sum is σ = 319889520. Its totient is φ = 106579968.

The previous prime is 213209797. The next prime is 213209809. The reversal of 213209806 is 608902312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213209809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230 + ... + 20686.

It is an arithmetic number, because the mean of its divisors is an integer number (39986190).

Almost surely, 2^213209806 is an apocalyptic number.

213209806 is a deficient number, since it is larger than the sum of its proper divisors (106679714).

213209806 is a wasteful number, since it uses less digits than its factorization.

213209806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24938.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 213209806 is about 14601.7055853075. The cubic root of 213209806 is about 597.4052822787.

The spelling of 213209806 in words is "two hundred thirteen million, two hundred nine thousand, eight hundred six".