212544450145 has 4 divisors (see below), whose sum is σ = 255053340180. Its totient is φ = 170035560112.

The previous prime is 212544450137. The next prime is 212544450193. The reversal of 212544450145 is 541054445212.

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 26221001041 + 186323449104 = 161929^2 + 431652^2 .

It is a cyclic number.

It is not a de Polignac number, because 212544450145 - 2³ = 212544450137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21254445010 + ... + 21254445019.

It is an arithmetic number, because the mean of its divisors is an integer number (63763335045).

Almost surely, 2^212544450145 is an apocalyptic number.

It is an amenable number.

212544450145 is a deficient number, since it is larger than the sum of its proper divisors (42508890035).

212544450145 is an equidigital number, since it uses as much as digits as its factorization.

212544450145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42508890034.

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 212544450145 its reverse (541054445212), we get a palindrome (753598895357).

The spelling of 212544450145 in words is "two hundred twelve billion, five hundred forty-four million, four hundred fifty thousand, one hundred forty-five".