21946267859 has 2 divisors, whose sum is σ = 21946267860. Its totient is φ = 21946267858.

The previous prime is 21946267829. The next prime is 21946267867. The reversal of 21946267859 is 95876264912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21946267859 - 2¹⁶ = 21946202323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21946267798 and 21946267807.

It is not a weakly prime, because it can be changed into another prime (21946267829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10973133929 + 10973133930.

It is an arithmetic number, because the mean of its divisors is an integer number (10973133930).

Almost surely, 2^21946267859 is an apocalyptic number.

21946267859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21946267859 is an equidigital number, since it uses as much as digits as its factorization.

21946267859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 59.

The spelling of 21946267859 in words is "twenty-one billion, nine hundred forty-six million, two hundred sixty-seven thousand, eight hundred fifty-nine".