211140145 has 4 divisors (see below), whose sum is σ = 253368180. Its totient is φ = 168912112.

The previous prime is 211140143. The next prime is 211140199. The reversal of 211140145 is 541041112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131698576 + 79441569 = 11476^2 + 8913^2 .

It is a cyclic number.

It is not a de Polignac number, because 211140145 - 2¹ = 211140143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211140143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21114010 + ... + 21114019.

It is an arithmetic number, because the mean of its divisors is an integer number (63342045).

Almost surely, 2^211140145 is an apocalyptic number.

It is an amenable number.

211140145 is a deficient number, since it is larger than the sum of its proper divisors (42228035).

211140145 is an equidigital number, since it uses as much as digits as its factorization.

211140145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42228034.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 211140145 is about 14530.6622354248. The cubic root of 211140145 is about 595.4659580022.

Adding to 211140145 its reverse (541041112), we get a palindrome (752181257).

The spelling of 211140145 in words is "two hundred eleven million, one hundred forty thousand, one hundred forty-five".