212395005 has 12 divisors (see below), whose sum is σ = 368151420. Its totient is φ = 113277312.

The previous prime is 212395003. The next prime is 212395037. The reversal of 212395005 is 500593212.

It can be written as a sum of positive squares in 2 ways, for example, as 150332121 + 62062884 = 12261^2 + 7878^2 .

It is not a de Polignac number, because 212395005 - 2¹ = 212395003 is a prime.

It is a super-2 number, since 2×212395005² = 90223276297900050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212395005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212395003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2359900 + ... + 2359989.

It is an arithmetic number, because the mean of its divisors is an integer number (30679285).

Almost surely, 2^212395005 is an apocalyptic number.

It is an amenable number.

212395005 is a deficient number, since it is larger than the sum of its proper divisors (155756415).

212395005 is a wasteful number, since it uses less digits than its factorization.

212395005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4719900 (or 4719897 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 212395005 is about 14573.7779933688. Note that the first 3 decimals coincide. The cubic root of 212395005 is about 596.6432976016.

It can be divided in two parts, 21239 and 5005, that added together give a square (26244 = 162²).

The spelling of 212395005 in words is "two hundred twelve million, three hundred ninety-five thousand, five".