21848825 has 24 divisors (see below), whose sum is σ = 29027160. Its totient is φ = 16256000.

The previous prime is 21848809. The next prime is 21848857. The reversal of 21848825 is 52884812.

It can be written as a sum of positive squares in 12 ways, for example, as 123904 + 21724921 = 352^2 + 4661^2 .

It is not a de Polignac number, because 21848825 - 2⁴ = 21848809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42671 + ... + 43179.

It is an arithmetic number, because the mean of its divisors is an integer number (1209465).

Almost surely, 2^21848825 is an apocalyptic number.

21848825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21848825 is a deficient number, since it is larger than the sum of its proper divisors (7178335).

21848825 is a wasteful number, since it uses less digits than its factorization.

21848825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 632 counting only the distinct ones).

The product of its digits is 40960, while the sum is 38.

The square root of 21848825 is about 4674.2726706943. The cubic root of 21848825 is about 279.5606417297.

The spelling of 21848825 in words is "twenty-one million, eight hundred forty-eight thousand, eight hundred twenty-five".