21231341213 has 2 divisors, whose sum is σ = 21231341214. Its totient is φ = 21231341212.

The previous prime is 21231341167. The next prime is 21231341233. The reversal of 21231341213 is 31214313212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19504356964 + 1726984249 = 139658^2 + 41557^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231341213 - 2¹⁶ = 21231275677 is a prime.

It is a super-2 number, since 2×21231341213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231341233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615670606 + 10615670607.

It is an arithmetic number, because the mean of its divisors is an integer number (10615670607).

Almost surely, 2^21231341213 is an apocalyptic number.

It is an amenable number.

21231341213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231341213 is an equidigital number, since it uses as much as digits as its factorization.

21231341213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 21231341213 its reverse (31214313212), we get a palindrome (52445654425).

The spelling of 21231341213 in words is "twenty-one billion, two hundred thirty-one million, three hundred forty-one thousand, two hundred thirteen".