21453143213 has 2 divisors, whose sum is σ = 21453143214. Its totient is φ = 21453143212.

The previous prime is 21453143099. The next prime is 21453143227. The reversal of 21453143213 is 31234135412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12926098249 + 8527044964 = 113693^2 + 92342^2 .

It is a cyclic number.

It is not a de Polignac number, because 21453143213 - 2⁸ = 21453142957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21453143233) 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 as a sum of consecutive naturals, namely, 10726571606 + 10726571607.

It is an arithmetic number, because the mean of its divisors is an integer number (10726571607).

Almost surely, 2^21453143213 is an apocalyptic number.

It is an amenable number.

21453143213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453143213 is an equidigital number, since it uses as much as digits as its factorization.

21453143213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

Adding to 21453143213 its reverse (31234135412), we get a palindrome (52687278625).

The spelling of 21453143213 in words is "twenty-one billion, four hundred fifty-three million, one hundred forty-three thousand, two hundred thirteen".