212819005 has 48 divisors (see below), whose sum is σ = 323288496. Its totient is φ = 133539840.

The previous prime is 212818979. The next prime is 212819011. The reversal of 212819005 is 500918212.

It can be written as a sum of positive squares in 8 ways, for example, as 16426809 + 196392196 = 4053^2 + 14014^2 .

It is not a de Polignac number, because 212819005 - 2⁷ = 212818877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 153415 + ... + 154795.

It is an arithmetic number, because the mean of its divisors is an integer number (6735177).

Almost surely, 2^212819005 is an apocalyptic number.

It is an amenable number.

212819005 is a deficient number, since it is larger than the sum of its proper divisors (110469491).

212819005 is a wasteful number, since it uses less digits than its factorization.

212819005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 212819005 is about 14588.3174149728. The cubic root of 212819005 is about 597.0400561586.

The spelling of 212819005 in words is "two hundred twelve million, eight hundred nineteen thousand, five".