212143005 has 24 divisors (see below), whose sum is σ = 369310968. Its totient is φ = 112651776.

The previous prime is 212143003. The next prime is 212143021. The reversal of 212143005 is 500341212.

212143005 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 6335289 + 205807716 = 2517^2 + 14346^2 .

It is not a de Polignac number, because 212143005 - 2¹ = 212143003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212143003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369 + ... + 20601.

It is an arithmetic number, because the mean of its divisors is an integer number (15387957).

Almost surely, 2^212143005 is an apocalyptic number.

It is an amenable number.

212143005 is a deficient number, since it is larger than the sum of its proper divisors (157167963).

212143005 is a wasteful number, since it uses less digits than its factorization.

212143005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20477 (or 20474 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 212143005 is about 14565.1297625528. The cubic root of 212143005 is about 596.4072380425.

Adding to 212143005 its reverse (500341212), we get a palindrome (712484217).

The spelling of 212143005 in words is "two hundred twelve million, one hundred forty-three thousand, five".