212113103123321 has 4 divisors (see below), whose sum is σ = 217286593443444. Its totient is φ = 206939612803200.

The previous prime is 212113103123309. The next prime is 212113103123347. The reversal of 212113103123321 is 123321301311212.

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 98635983349225 + 113477119774096 = 9931565^2 + 10652564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212113103123321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212113103423321) 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, 2586745160000 + ... + 2586745160081.

It is an arithmetic number, because the mean of its divisors is an integer number (54321648360861).

Almost surely, 2^{212113103123321} is an apocalyptic number.

It is an amenable number.

212113103123321 is a deficient number, since it is larger than the sum of its proper divisors (5173490320123).

212113103123321 is an equidigital number, since it uses as much as digits as its factorization.

212113103123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173490320122.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 212113103123321 its reverse (123321301311212), we get a palindrome (335434404434533).

The spelling of 212113103123321 in words is "two hundred twelve trillion, one hundred thirteen billion, one hundred three million, one hundred twenty-three thousand, three hundred twenty-one".