21231311121313 has 8 divisors (see below), whose sum is σ = 22008524748480. Its totient is φ = 20457104124240.

The previous prime is 21231311121299. The next prime is 21231311121329. The reversal of 21231311121313 is 31312111313212.

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 21231311121313 - 2⁹ = 21231311120801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231311121353) 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 7 ways as a sum of consecutive naturals, for example, 751643143 + ... + 751671388.

It is an arithmetic number, because the mean of its divisors is an integer number (2751065593560).

Almost surely, 2^{21231311121313} is an apocalyptic number.

It is an amenable number.

21231311121313 is a deficient number, since it is larger than the sum of its proper divisors (777213627167).

21231311121313 is a wasteful number, since it uses less digits than its factorization.

21231311121313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503315047.

The product of its digits is 648, while the sum is 25.

Adding to 21231311121313 its reverse (31312111313212), we get a palindrome (52543422434525).

The spelling of 21231311121313 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred eleven million, one hundred twenty-one thousand, three hundred thirteen".