212705 has 8 divisors (see below), whose sum is σ = 268800. Its totient is φ = 161136.

The previous prime is 212701. The next prime is 212777. The reversal of 212705 is 507212.

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 212705 - 2² = 212701 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (212701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025 + ... + 1214.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2²¹²⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

212705 is a deficient number, since it is larger than the sum of its proper divisors (56095).

212705 is a wasteful number, since it uses less digits than its factorization.

212705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 212705 is about 461.1995229833. The cubic root of 212705 is about 59.6933427666.

Adding to 212705 its reverse (507212), we get a palindrome (719917).

The spelling of 212705 in words is "two hundred twelve thousand, seven hundred five".