212117005 has 4 divisors (see below), whose sum is σ = 254540412. Its totient is φ = 169693600.

The previous prime is 212116999. The next prime is 212117011. The reversal of 212117005 is 500711212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212116999) and next prime (212117011).

It can be written as a sum of positive squares in 2 ways, for example, as 138603529 + 73513476 = 11773^2 + 8574^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212117005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21211696 + ... + 21211705.

It is an arithmetic number, because the mean of its divisors is an integer number (63635103).

Almost surely, 2^212117005 is an apocalyptic number.

It is an amenable number.

212117005 is a deficient number, since it is larger than the sum of its proper divisors (42423407).

212117005 is an equidigital number, since it uses as much as digits as its factorization.

212117005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42423406.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 212117005 is about 14564.2371925206. The cubic root of 212117005 is about 596.3828720545.

Adding to 212117005 its reverse (500711212), we get a palindrome (712828217).

The spelling of 212117005 in words is "two hundred twelve million, one hundred seventeen thousand, five".