21652145 has 8 divisors (see below), whose sum is σ = 26235456. Its totient is φ = 17153136.

The previous prime is 21652121. The next prime is 21652159. The reversal of 21652145 is 54125612.

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

It is a cyclic number.

It is not a de Polignac number, because 21652145 - 2¹⁰ = 21651121 is a prime.

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

It is a Duffinian 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, 20507 + ... + 21536.

It is an arithmetic number, because the mean of its divisors is an integer number (3279432).

Almost surely, 2^21652145 is an apocalyptic number.

It is an amenable number.

21652145 is a deficient number, since it is larger than the sum of its proper divisors (4583311).

21652145 is a wasteful number, since it uses less digits than its factorization.

21652145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42151.

The product of its digits is 2400, while the sum is 26.

The square root of 21652145 is about 4653.1865425749. The cubic root of 21652145 is about 278.7192570008.

Adding to 21652145 its reverse (54125612), we get a palindrome (75777757).

The spelling of 21652145 in words is "twenty-one million, six hundred fifty-two thousand, one hundred forty-five".