21448105 has 16 divisors (see below), whose sum is σ = 29790720. Its totient is φ = 14519232.

The previous prime is 21448079. The next prime is 21448127. The reversal of 21448105 is 50184412.

It is not a de Polignac number, because 21448105 - 2⁹ = 21447593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21448105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1114 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (1861920).

Almost surely, 2^21448105 is an apocalyptic number.

It is an amenable number.

21448105 is a deficient number, since it is larger than the sum of its proper divisors (8342615).

21448105 is an equidigital number, since it uses as much as digits as its factorization.

21448105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21448105 is about 4631.2098851164. The cubic root of 21448105 is about 277.8409844018.

The spelling of 21448105 in words is "twenty-one million, four hundred forty-eight thousand, one hundred five".