21448079 has 2 divisors, whose sum is σ = 21448080. Its totient is φ = 21448078.

The previous prime is 21448051. The next prime is 21448127. The reversal of 21448079 is 97084412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21448079 - 2²⁰ = 20399503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21448379) 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, 10724039 + 10724040.

It is an arithmetic number, because the mean of its divisors is an integer number (10724040).

Almost surely, 2^21448079 is an apocalyptic number.

21448079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448079 is an equidigital number, since it uses as much as digits as its factorization.

21448079 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21448079 is about 4631.2070780737. The cubic root of 21448079 is about 277.8408721329.

The spelling of 21448079 in words is "twenty-one million, four hundred forty-eight thousand, seventy-nine".