212052645605 has 16 divisors (see below), whose sum is σ = 256756212720. Its totient is φ = 168113906688.

The previous prime is 212052645601. The next prime is 212052645631. The reversal of 212052645605 is 506546250212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 22933770721 + 189118874884 = 151439^2 + 434878^2 .

It is a cyclic number.

It is not a de Polignac number, because 212052645605 - 2² = 212052645601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212052645601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3967439 + ... + 4020531.

It is an arithmetic number, because the mean of its divisors is an integer number (16047263295).

Almost surely, 2^212052645605 is an apocalyptic number.

It is an amenable number.

212052645605 is a deficient number, since it is larger than the sum of its proper divisors (44703567115).

212052645605 is a wasteful number, since it uses less digits than its factorization.

212052645605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60280.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 212052645605 its reverse (506546250212), we get a palindrome (718598895817).

The spelling of 212052645605 in words is "two hundred twelve billion, fifty-two million, six hundred forty-five thousand, six hundred five".