21591000967 has 2 divisors, whose sum is σ = 21591000968. Its totient is φ = 21591000966.

The previous prime is 21591000919. The next prime is 21591000997. The reversal of 21591000967 is 76900019512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21591000967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21591000997) 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, 10795500483 + 10795500484.

It is an arithmetic number, because the mean of its divisors is an integer number (10795500484).

Almost surely, 2^21591000967 is an apocalyptic number.

21591000967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21591000967 is an equidigital number, since it uses as much as digits as its factorization.

21591000967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 21591000967 in words is "twenty-one billion, five hundred ninety-one million, nine hundred sixty-seven", and thus it is an aban number.