21683325 has 12 divisors (see below), whose sum is σ = 35849888. Its totient is φ = 11564400.

The previous prime is 21683317. The next prime is 21683327. The reversal of 21683325 is 52338612.

It is not a de Polignac number, because 21683325 - 2³ = 21683317 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21683292 and 21683301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144481 + ... + 144630.

Almost surely, 2^21683325 is an apocalyptic number.

21683325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21683325 is a deficient number, since it is larger than the sum of its proper divisors (14166563).

21683325 is a wasteful number, since it uses less digits than its factorization.

21683325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289124 (or 289119 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 21683325 is about 4656.5357294882. The cubic root of 21683325 is about 278.8529819847.

The spelling of 21683325 in words is "twenty-one million, six hundred eighty-three thousand, three hundred twenty-five".