21652385 has 8 divisors (see below), whose sum is σ = 26139456. Its totient is φ = 17217520.

The previous prime is 21652331. The next prime is 21652391. The reversal of 21652385 is 58325612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21652385 - 2¹⁶ = 21586849 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12131 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (3267432).

Almost surely, 2^21652385 is an apocalyptic number.

It is an amenable number.

21652385 is a deficient number, since it is larger than the sum of its proper divisors (4487071).

21652385 is a wasteful number, since it uses less digits than its factorization.

21652385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26103.

The product of its digits is 14400, while the sum is 32.

The square root of 21652385 is about 4653.2123312826. The cubic root of 21652385 is about 278.7202868045.

Adding to 21652385 its reverse (58325612), we get a palindrome (79977997).

The spelling of 21652385 in words is "twenty-one million, six hundred fifty-two thousand, three hundred eighty-five".