212721370805 has 8 divisors (see below), whose sum is σ = 255651829944. Its totient is φ = 169919640000.

The previous prime is 212721370777. The next prime is 212721370847. The reversal of 212721370805 is 508073127212.

212721370805 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 4 ways, for example, as 112730077009 + 99991293796 = 335753^2 + 316214^2 .

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

It is not a de Polignac number, because 212721370805 - 2¹⁰ = 212721369781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 32178446 + ... + 32185055.

It is an arithmetic number, because the mean of its divisors is an integer number (31956478743).

Almost surely, 2^212721370805 is an apocalyptic number.

It is an amenable number.

212721370805 is a deficient number, since it is larger than the sum of its proper divisors (42930459139).

212721370805 is an equidigital number, since it uses as much as digits as its factorization.

212721370805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64364167.

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 212721370805 in words is "two hundred twelve billion, seven hundred twenty-one million, three hundred seventy thousand, eight hundred five".