21448125 has 80 divisors (see below), whose sum is σ = 41986560. Its totient is φ = 10800000.

The previous prime is 21448079. The next prime is 21448127. The reversal of 21448125 is 52184412.

It is not a de Polignac number, because 21448125 - 2⁸ = 21447869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (2560) is a multiple of the sum of its prime divisors (80).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448127) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 523105 + ... + 523145.

It is an arithmetic number, because the mean of its divisors is an integer number (524832).

Almost surely, 2^21448125 is an apocalyptic number.

21448125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21448125 is a deficient number, since it is larger than the sum of its proper divisors (20538435).

21448125 is an equidigital number, since it uses as much as digits as its factorization.

21448125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 80 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21448125 is about 4631.2120443789. The cubic root of 21448125 is about 277.8410707625.

The spelling of 21448125 in words is "twenty-one million, four hundred forty-eight thousand, one hundred twenty-five".