21416867 has 2 divisors, whose sum is σ = 21416868. Its totient is φ = 21416866.

The previous prime is 21416839. The next prime is 21416869. The reversal of 21416867 is 76861412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21416867 - 2⁶ = 21416803 is a prime.

Together with 21416869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21416869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708433 + 10708434.

It is an arithmetic number, because the mean of its divisors is an integer number (10708434).

Almost surely, 2^21416867 is an apocalyptic number.

21416867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416867 is an equidigital number, since it uses as much as digits as its factorization.

21416867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 21416867 is about 4627.8361034073. The cubic root of 21416867 is about 277.7060320960.

The spelling of 21416867 in words is "twenty-one million, four hundred sixteen thousand, eight hundred sixty-seven".