212240400144021 has 6 divisors (see below), whose sum is σ = 306569466874710. Its totient is φ = 141493600096008.

The previous prime is 212240400143953. The next prime is 212240400144067. The reversal of 212240400144021 is 120441004042212.

212240400144021 is a `hidden beast` number, since 2 + 1 + 2 + 240 + 4 + 0 + 0 + 14 + 402 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 182445505403121 + 29794894740900 = 13507239^2 + 5458470^2 .

It is not a de Polignac number, because 212240400144021 - 2⁴⁵ = 177056028055189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212240400104021) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11791133341326 + ... + 11791133341343.

It is an arithmetic number, because the mean of its divisors is an integer number (51094911145785).

Almost surely, 2^{212240400144021} is an apocalyptic number.

It is an amenable number.

212240400144021 is a deficient number, since it is larger than the sum of its proper divisors (94329066730689).

212240400144021 is a wasteful number, since it uses less digits than its factorization.

212240400144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23582266682675 (or 23582266682672 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 212240400144021 its reverse (120441004042212), we get a palindrome (332681404186233).

The spelling of 212240400144021 in words is "two hundred twelve trillion, two hundred forty billion, four hundred million, one hundred forty-four thousand, twenty-one".