212105712056212 has 72 divisors (see below), whose sum is σ = 406467460226520. Its totient is φ = 96793432819200.

The previous prime is 212105712056201. The next prime is 212105712056213. The reversal of 212105712056212 is 212650217501212.

It can be written as a sum of positive squares in 12 ways, for example, as 40405677050116 + 171700035006096 = 6356546^2 + 13103436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212105712056213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47927214 + ... + 52165402.

It is an arithmetic number, because the mean of its divisors is an integer number (5645381392035).

Almost surely, 2^{212105712056212} is an apocalyptic number.

It is an amenable number.

212105712056212 is a deficient number, since it is larger than the sum of its proper divisors (194361748170308).

212105712056212 is a wasteful number, since it uses less digits than its factorization.

212105712056212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239053 (or 4239038 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

Adding to 212105712056212 its reverse (212650217501212), we get a palindrome (424755929557424).

The spelling of 212105712056212 in words is "two hundred twelve trillion, one hundred five billion, seven hundred twelve million, fifty-six thousand, two hundred twelve".