212172027605 has 16 divisors (see below), whose sum is σ = 262834051584. Its totient is φ = 164253147840.

The previous prime is 212172027601. The next prime is 212172027611. The reversal of 212172027605 is 506720271212.

212172027605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212172027605 - 2² = 212172027601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212172027601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4647902 + ... + 4693328.

It is an arithmetic number, because the mean of its divisors is an integer number (16427128224).

Almost surely, 2^212172027605 is an apocalyptic number.

It is an amenable number.

212172027605 is a deficient number, since it is larger than the sum of its proper divisors (50662023979).

212172027605 is a wasteful number, since it uses less digits than its factorization.

212172027605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75596.

The product of its (nonzero) digits is 23520, while the sum is 35.

Adding to 212172027605 its reverse (506720271212), we get a palindrome (718892298817).

The spelling of 212172027605 in words is "two hundred twelve billion, one hundred seventy-two million, twenty-seven thousand, six hundred five".