21848125 has 20 divisors (see below), whose sum is σ = 29412460. Its totient is φ = 16128000.

The previous prime is 21848117. The next prime is 21848129. The reversal of 21848125 is 52184812.

It can be written as a sum of positive squares in 10 ways, for example, as 21846276 + 1849 = 4674^2 + 43^2 .

It is not a de Polignac number, because 21848125 - 2³ = 21848117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6781 + ... + 9469.

It is an arithmetic number, because the mean of its divisors is an integer number (1470623).

Almost surely, 2^21848125 is an apocalyptic number.

21848125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21848125 is a deficient number, since it is larger than the sum of its proper divisors (7564335).

21848125 is an equidigital number, since it uses as much as digits as its factorization.

21848125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722 (or 2707 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 21848125 is about 4674.1977921350. The cubic root of 21848125 is about 279.5576561452.

The spelling of 21848125 in words is "twenty-one million, eight hundred forty-eight thousand, one hundred twenty-five".