212187113 has 4 divisors (see below), whose sum is σ = 219503940. Its totient is φ = 204870288.

The previous prime is 212187109. The next prime is 212187161. The reversal of 212187113 is 311781212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 120736144 + 91450969 = 10988^2 + 9563^2 .

It is a cyclic number.

It is not a de Polignac number, because 212187113 - 2² = 212187109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212187103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658370 + ... + 3658427.

It is an arithmetic number, because the mean of its divisors is an integer number (54875985).

Almost surely, 2^212187113 is an apocalyptic number.

It is an amenable number.

212187113 is a deficient number, since it is larger than the sum of its proper divisors (7316827).

212187113 is an equidigital number, since it uses as much as digits as its factorization.

212187113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7316826.

The product of its digits is 672, while the sum is 26.

The square root of 212187113 is about 14566.6438481896. The cubic root of 212187113 is about 596.4485694508.

The spelling of 212187113 in words is "two hundred twelve million, one hundred eighty-seven thousand, one hundred thirteen".