21968041523 has 2 divisors, whose sum is σ = 21968041524. Its totient is φ = 21968041522.

The previous prime is 21968041507. The next prime is 21968041549. The reversal of 21968041523 is 32514086912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21968041523 - 2⁴ = 21968041507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21968041723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10984020761 + 10984020762.

It is an arithmetic number, because the mean of its divisors is an integer number (10984020762).

Almost surely, 2^21968041523 is an apocalyptic number.

21968041523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21968041523 is an equidigital number, since it uses as much as digits as its factorization.

21968041523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 21968041523 in words is "twenty-one billion, nine hundred sixty-eight million, forty-one thousand, five hundred twenty-three".