213123121303 has 8 divisors (see below), whose sum is σ = 216319199600. Its totient is φ = 209927488320.

The previous prime is 213123121301. The next prime is 213123121327. The reversal of 213123121303 is 303121321312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213123121303 - 2¹ = 213123121301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123121301) 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 7 ways as a sum of consecutive naturals, for example, 924763 + ... + 1132003.

It is an arithmetic number, because the mean of its divisors is an integer number (27039899950).

Almost surely, 2^213123121303 is an apocalyptic number.

213123121303 is a deficient number, since it is larger than the sum of its proper divisors (3196078297).

213123121303 is a wasteful number, since it uses less digits than its factorization.

213123121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222657.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 213123121303 its reverse (303121321312), we get a palindrome (516244442615).

Subtracting 213123121303 from its reverse (303121321312), we obtain a square (89998200009 = 299997²).

The spelling of 213123121303 in words is "two hundred thirteen billion, one hundred twenty-three million, one hundred twenty-one thousand, three hundred three".