21834125 has 8 divisors (see below), whose sum is σ = 27249144. Its totient is φ = 17467200.

The previous prime is 21834121. The next prime is 21834167. The reversal of 21834125 is 52143812.

It can be written as a sum of positive squares in 4 ways, for example, as 276676 + 21557449 = 526^2 + 4643^2 .

It is not a de Polignac number, because 21834125 - 2² = 21834121 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21834094 and 21834103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87212 + ... + 87461.

It is an arithmetic number, because the mean of its divisors is an integer number (3406143).

Almost surely, 2^21834125 is an apocalyptic number.

21834125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21834125 is a deficient number, since it is larger than the sum of its proper divisors (5415019).

21834125 is an equidigital number, since it uses as much as digits as its factorization.

21834125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174688 (or 174678 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21834125 is about 4672.6999689687. The cubic root of 21834125 is about 279.4979310589.

Adding to 21834125 its reverse (52143812), we get a palindrome (73977937).

It can be divided in two parts, 218 and 34125, that added together give a palindrome (34343).

The spelling of 21834125 in words is "twenty-one million, eight hundred thirty-four thousand, one hundred twenty-five".