21682125 has 24 divisors (see below), whose sum is σ = 39087672. Its totient is φ = 11563200.

The previous prime is 21682109. The next prime is 21682139. The reversal of 21682125 is 52128612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 393129 + 21288996 = 627^2 + 4614^2 .

It is not a de Polignac number, because 21682125 - 2⁴ = 21682109 is a prime.

It is a super-2 number, since 2×21682125² = 940229089031250, which contains 22 as substring.

It is a congruent 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, 8512 + ... + 10761.

It is an arithmetic number, because the mean of its divisors is an integer number (1628653).

Almost surely, 2^21682125 is an apocalyptic number.

21682125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21682125 is a deficient number, since it is larger than the sum of its proper divisors (17405547).

21682125 is a wasteful number, since it uses less digits than its factorization.

21682125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19294 (or 19281 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 21682125 is about 4656.4068765519. The cubic root of 21682125 is about 278.8478377898.

The spelling of 21682125 in words is "twenty-one million, six hundred eighty-two thousand, one hundred twenty-five".