21231313011213 has 16 divisors (see below), whose sum is σ = 28592086634496. Its totient is φ = 14012407246400.

The previous prime is 21231313011203. The next prime is 21231313011217. The reversal of 21231313011213 is 31211031313212.

It is a cyclic number.

It is not a de Polignac number, because 21231313011213 - 2²¹ = 21231310914061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231313011217) 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 15 ways as a sum of consecutive naturals, for example, 1588206 + ... + 6707087.

It is an arithmetic number, because the mean of its divisors is an integer number (1787005414656).

Almost surely, 2^{21231313011213} is an apocalyptic number.

It is an amenable number.

21231313011213 is a deficient number, since it is larger than the sum of its proper divisors (7360773623283).

21231313011213 is a wasteful number, since it uses less digits than its factorization.

21231313011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303844.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21231313011213 its reverse (31211031313212), we get a palindrome (52442344324425).

The spelling of 21231313011213 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred thirteen million, eleven thousand, two hundred thirteen".