21189682643 has 2 divisors, whose sum is σ = 21189682644. Its totient is φ = 21189682642.

The previous prime is 21189682603. The next prime is 21189682651. The reversal of 21189682643 is 34628698112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21189682643 - 2¹⁶ = 21189617107 is a prime.

It is a super-2 number, since 2×21189682643² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21189682591 and 21189682600.

It is not a weakly prime, because it can be changed into another prime (21189682603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10594841321 + 10594841322.

It is an arithmetic number, because the mean of its divisors is an integer number (10594841322).

Almost surely, 2^21189682643 is an apocalyptic number.

21189682643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21189682643 is an equidigital number, since it uses as much as digits as its factorization.

21189682643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The spelling of 21189682643 in words is "twenty-one billion, one hundred eighty-nine million, six hundred eighty-two thousand, six hundred forty-three".