21904389467 has 2 divisors, whose sum is σ = 21904389468. Its totient is φ = 21904389466.

The previous prime is 21904389461. The next prime is 21904389497. The reversal of 21904389467 is 76498340912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21904389467 - 2¹⁴ = 21904373083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21904389461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10952194733 + 10952194734.

It is an arithmetic number, because the mean of its divisors is an integer number (10952194734).

Almost surely, 2^21904389467 is an apocalyptic number.

21904389467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21904389467 is an equidigital number, since it uses as much as digits as its factorization.

21904389467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 21904389467 in words is "twenty-one billion, nine hundred four million, three hundred eighty-nine thousand, four hundred sixty-seven".