213109805 has 8 divisors (see below), whose sum is σ = 256408800. Its totient is φ = 170036496.

The previous prime is 213109801. The next prime is 213109811. The reversal of 213109805 is 508901312.

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 213109805 - 2² = 213109801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213109801) 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, 54335 + ... + 58124.

It is an arithmetic number, because the mean of its divisors is an integer number (32051100).

Almost surely, 2^213109805 is an apocalyptic number.

It is an amenable number.

213109805 is a deficient number, since it is larger than the sum of its proper divisors (43298995).

213109805 is a wasteful number, since it uses less digits than its factorization.

213109805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112843.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 213109805 is about 14598.2808919407. The cubic root of 213109805 is about 597.3118680822.

The spelling of 213109805 in words is "two hundred thirteen million, one hundred nine thousand, eight hundred five".