212820671066 has 8 divisors (see below), whose sum is σ = 319232965044. Its totient is φ = 106409682720.

The previous prime is 212820671053. The next prime is 212820671071. The reversal of 212820671066 is 660176028212.

212820671066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 134154445441 + 78666225625 = 366271^2 + 280475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460976 + ... + 798836.

Almost surely, 2^212820671066 is an apocalyptic number.

212820671066 is a deficient number, since it is larger than the sum of its proper divisors (106412293978).

212820671066 is a wasteful number, since it uses less digits than its factorization.

212820671066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652816.

The product of its (nonzero) digits is 96768, while the sum is 41.

Adding to 212820671066 its reverse (660176028212), we get a palindrome (872996699278).

The spelling of 212820671066 in words is "two hundred twelve billion, eight hundred twenty million, six hundred seventy-one thousand, sixty-six".