21231322132213 has 2 divisors, whose sum is σ = 21231322132214. Its totient is φ = 21231322132212.

The previous prime is 21231322132211. The next prime is 21231322132217. The reversal of 21231322132213 is 31223122313212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17591171037489 + 3640151094724 = 4194183^2 + 1907918^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231322132213 - 2¹ = 21231322132211 is a prime.

Together with 21231322132211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231322132211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615661066106 + 10615661066107.

It is an arithmetic number, because the mean of its divisors is an integer number (10615661066107).

Almost surely, 2^{21231322132213} is an apocalyptic number.

It is an amenable number.

21231322132213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231322132213 is an equidigital number, since it uses as much as digits as its factorization.

21231322132213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

Adding to 21231322132213 its reverse (31223122313212), we get a palindrome (52454444445425).

The spelling of 21231322132213 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty-two million, one hundred thirty-two thousand, two hundred thirteen".