212168851 has 4 divisors (see below), whose sum is σ = 212455152. Its totient is φ = 211882552.

The previous prime is 212168849. The next prime is 212168861. The reversal of 212168851 is 158861212.

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

It is a cyclic number.

It is not a de Polignac number, because 212168851 - 2¹ = 212168849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212168861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142036 + ... + 143521.

It is an arithmetic number, because the mean of its divisors is an integer number (53113788).

Almost surely, 2^212168851 is an apocalyptic number.

212168851 is a deficient number, since it is larger than the sum of its proper divisors (286301).

212168851 is an equidigital number, since it uses as much as digits as its factorization.

212168851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286300.

The product of its digits is 7680, while the sum is 34.

The square root of 212168851 is about 14566.0169916144. The cubic root of 212168851 is about 596.4314577357.

The spelling of 212168851 in words is "two hundred twelve million, one hundred sixty-eight thousand, eight hundred fifty-one".