21692345539 has 2 divisors, whose sum is σ = 21692345540. Its totient is φ = 21692345538.

The previous prime is 21692345527. The next prime is 21692345611. The reversal of 21692345539 is 93554329612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21692345539 - 2⁹ = 21692345027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21692345492 and 21692345501.

It is not a weakly prime, because it can be changed into another prime (21692346539) 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, 10846172769 + 10846172770.

It is an arithmetic number, because the mean of its divisors is an integer number (10846172770).

Almost surely, 2^21692345539 is an apocalyptic number.

21692345539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21692345539 is an equidigital number, since it uses as much as digits as its factorization.

21692345539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 49.

The spelling of 21692345539 in words is "twenty-one billion, six hundred ninety-two million, three hundred forty-five thousand, five hundred thirty-nine".