21782325 has 24 divisors (see below), whose sum is σ = 36158400. Its totient is φ = 11570560.

The previous prime is 21782323. The next prime is 21782329. The reversal of 21782325 is 52328712.

It is not a de Polignac number, because 21782325 - 2¹ = 21782323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21782292 and 21782301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21782323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26521 + ... + 27329.

It is an arithmetic number, because the mean of its divisors is an integer number (1506600).

Almost surely, 2^21782325 is an apocalyptic number.

21782325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21782325 is a deficient number, since it is larger than the sum of its proper divisors (14376075).

21782325 is a wasteful number, since it uses less digits than its factorization.

21782325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1176 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 21782325 is about 4667.1538436182. The cubic root of 21782325 is about 279.2767259911.

The spelling of 21782325 in words is "twenty-one million, seven hundred eighty-two thousand, three hundred twenty-five".