212121310221113 has 4 divisors (see below), whose sum is σ = 213031702110708. Its totient is φ = 211210918331520.

The previous prime is 212121310221103. The next prime is 212121310221179. The reversal of 212121310221113 is 311122013121212.

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 61372934791744 + 150748375429369 = 7834088^2 + 12277963^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121310221113 - 2⁴ = 212121310221097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121310221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455195944448 + ... + 455195944913.

It is an arithmetic number, because the mean of its divisors is an integer number (53257925527677).

Almost surely, 2^{212121310221113} is an apocalyptic number.

It is an amenable number.

212121310221113 is a deficient number, since it is larger than the sum of its proper divisors (910391889595).

212121310221113 is an equidigital number, since it uses as much as digits as its factorization.

212121310221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910391889594.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 212121310221113 its reverse (311122013121212), we get a palindrome (523243323342325).

The spelling of 212121310221113 in words is "two hundred twelve trillion, one hundred twenty-one billion, three hundred ten million, two hundred twenty-one thousand, one hundred thirteen".