21167104087 has 2 divisors, whose sum is σ = 21167104088. Its totient is φ = 21167104086.

The previous prime is 21167104081. The next prime is 21167104129. The reversal of 21167104087 is 78040176112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21167104087 - 2⁷ = 21167103959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21167104081) 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, 10583552043 + 10583552044.

It is an arithmetic number, because the mean of its divisors is an integer number (10583552044).

Almost surely, 2^21167104087 is an apocalyptic number.

21167104087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167104087 is an equidigital number, since it uses as much as digits as its factorization.

21167104087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 21167104087 in words is "twenty-one billion, one hundred sixty-seven million, one hundred four thousand, eighty-seven".