212144134213021 has 4 divisors (see below), whose sum is σ = 224623200931452. Its totient is φ = 199665067494592.

The previous prime is 212144134213013. The next prime is 212144134213043. The reversal of 212144134213021 is 120312431441212.

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 184988425092025 + 27155709120996 = 13601045^2 + 5211114^2 .

It is a cyclic number.

It is not a de Polignac number, because 212144134213021 - 2³ = 212144134213013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212144134213061) 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, 6239533359190 + ... + 6239533359223.

It is an arithmetic number, because the mean of its divisors is an integer number (56155800232863).

Almost surely, 2^{212144134213021} is an apocalyptic number.

It is an amenable number.

212144134213021 is a deficient number, since it is larger than the sum of its proper divisors (12479066718431).

212144134213021 is a wasteful number, since it uses less digits than its factorization.

212144134213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12479066718430.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 212144134213021 its reverse (120312431441212), we get a palindrome (332456565654233).

The spelling of 212144134213021 in words is "two hundred twelve trillion, one hundred forty-four billion, one hundred thirty-four million, two hundred thirteen thousand, twenty-one".