21183343871 has 2 divisors, whose sum is σ = 21183343872. Its totient is φ = 21183343870.

The previous prime is 21183343793. The next prime is 21183343879. The reversal of 21183343871 is 17834338112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21183343871 - 2³⁰ = 20109602047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21183343879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591671935 + 10591671936.

It is an arithmetic number, because the mean of its divisors is an integer number (10591671936).

Almost surely, 2^21183343871 is an apocalyptic number.

21183343871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183343871 is an equidigital number, since it uses as much as digits as its factorization.

21183343871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The spelling of 21183343871 in words is "twenty-one billion, one hundred eighty-three million, three hundred forty-three thousand, eight hundred seventy-one".