21764467859 has 2 divisors, whose sum is σ = 21764467860. Its totient is φ = 21764467858.

The previous prime is 21764467849. The next prime is 21764467867. The reversal of 21764467859 is 95876446712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21764467859 is a prime.

It is a super-2 number, since 2×21764467859² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21764467798 and 21764467807.

It is not a weakly prime, because it can be changed into another prime (21764467819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10882233929 + 10882233930.

It is an arithmetic number, because the mean of its divisors is an integer number (10882233930).

Almost surely, 2^21764467859 is an apocalyptic number.

21764467859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21764467859 is an equidigital number, since it uses as much as digits as its factorization.

21764467859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 59.

The spelling of 21764467859 in words is "twenty-one billion, seven hundred sixty-four million, four hundred sixty-seven thousand, eight hundred fifty-nine".