21652075 has 6 divisors (see below), whose sum is σ = 26848604. Its totient is φ = 17321640.

The previous prime is 21652063. The next prime is 21652121. The reversal of 21652075 is 57025612.

It is not a de Polignac number, because 21652075 - 2⁹ = 21651563 is a prime.

It is a super-3 number, since 3×21652075³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433017 + ... + 433066.

Almost surely, 2^21652075 is an apocalyptic number.

21652075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21652075 is a deficient number, since it is larger than the sum of its proper divisors (5196529).

21652075 is an equidigital number, since it uses as much as digits as its factorization.

21652075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866093 (or 866088 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21652075 is about 4653.1790208416. The cubic root of 21652075 is about 278.7189566400.

Adding to 21652075 its reverse (57025612), we get a palindrome (78677687).

The spelling of 21652075 in words is "twenty-one million, six hundred fifty-two thousand, seventy-five".