21716325 has 18 divisors (see below), whose sum is σ = 38896754. Its totient is φ = 11581920.

The previous prime is 21716323. The next prime is 21716329. The reversal of 21716325 is 52361712.

It is a happy number.

21716325 is a `hidden beast` number, since 21 + 7 + 1 + 632 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1520289 + 20196036 = 1233^2 + 4494^2 .

It is not a de Polignac number, because 21716325 - 2¹ = 21716323 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716323) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48034 + ... + 48483.

Almost surely, 2^21716325 is an apocalyptic number.

21716325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21716325 is a deficient number, since it is larger than the sum of its proper divisors (17180429).

21716325 is a wasteful number, since it uses less digits than its factorization.

21716325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96533 (or 96525 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21716325 is about 4660.0777890503. The cubic root of 21716325 is about 278.9943730318.

The spelling of 21716325 in words is "twenty-one million, seven hundred sixteen thousand, three hundred twenty-five".