21652353 has 20 divisors (see below), whose sum is σ = 33392128. Its totient is φ = 13967640.

The previous prime is 21652331. The next prime is 21652391. The reversal of 21652353 is 35325612.

21652353 is a `hidden beast` number, since 2 + 1 + 652 + 3 + 5 + 3 = 666.

It is not a de Polignac number, because 21652353 - 2⁹ = 21651841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21656353) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1801 + ... + 6822.

Almost surely, 2^21652353 is an apocalyptic number.

It is an amenable number.

21652353 is a deficient number, since it is larger than the sum of its proper divisors (11739775).

21652353 is an equidigital number, since it uses as much as digits as its factorization.

21652353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666 (or 8657 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21652353 is about 4653.2088927965. The cubic root of 21652353 is about 278.7201494978.

Adding to 21652353 its reverse (35325612), we get a palindrome (56977965).

The spelling of 21652353 in words is "twenty-one million, six hundred fifty-two thousand, three hundred fifty-three".