21583871723 has 2 divisors, whose sum is σ = 21583871724. Its totient is φ = 21583871722.

The previous prime is 21583871707. The next prime is 21583871753. The reversal of 21583871723 is 32717838512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21583871723 - 2⁴ = 21583871707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21583871753) 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, 10791935861 + 10791935862.

It is an arithmetic number, because the mean of its divisors is an integer number (10791935862).

Almost surely, 2^21583871723 is an apocalyptic number.

21583871723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21583871723 is an equidigital number, since it uses as much as digits as its factorization.

21583871723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 47.

The spelling of 21583871723 in words is "twenty-one billion, five hundred eighty-three million, eight hundred seventy-one thousand, seven hundred twenty-three".