21345652 has 12 divisors (see below), whose sum is σ = 37649920. Its totient is φ = 10588536.

The previous prime is 21345637. The next prime is 21345703. The reversal of 21345652 is 25654312.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21345652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20502 + ... + 21517.

Almost surely, 2^21345652 is an apocalyptic number.

It is an amenable number.

21345652 is a deficient number, since it is larger than the sum of its proper divisors (16304268).

21345652 is a wasteful number, since it uses less digits than its factorization.

21345652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42150 (or 42148 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 21345652 is about 4620.1354958486. The cubic root of 21345652 is about 277.3978825085.

Adding to 21345652 its reverse (25654312), we get a palindrome (46999964).

The spelling of 21345652 in words is "twenty-one million, three hundred forty-five thousand, six hundred fifty-two".