213121320121303 has 12 divisors (see below), whose sum is σ = 234321028116840. Its totient is φ = 193693962748880.

The previous prime is 213121320121279. The next prime is 213121320121331. The reversal of 213121320121303 is 303121023121312.

It is not a de Polignac number, because 213121320121303 - 2¹⁷ = 213121319990231 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 (213121320121373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239061913 + ... + 239951746.

It is an arithmetic number, because the mean of its divisors is an integer number (19526752343070).

Almost surely, 2^{213121320121303} is an apocalyptic number.

213121320121303 is a deficient number, since it is larger than the sum of its proper divisors (21199707995537).

213121320121303 is a wasteful number, since it uses less digits than its factorization.

213121320121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479017358 (or 479017347 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 213121320121303 its reverse (303121023121312), we get a palindrome (516242343242615).

The spelling of 213121320121303 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred twenty million, one hundred twenty-one thousand, three hundred three".