21535132 has 24 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 10137456.

The previous prime is 21535123. The next prime is 21535169. The reversal of 21535132 is 23153512.

It is a plaindrome in base 16.

It is a congruent 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, 12813 + ... + 14395.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^21535132 is an apocalyptic number.

It is an amenable number.

21535132 is a deficient number, since it is larger than the sum of its proper divisors (18381668).

21535132 is a wasteful number, since it uses less digits than its factorization.

21535132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1783 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 21535132 is about 4640.5960824015. The cubic root of 21535132 is about 278.2162628919.

Adding to 21535132 its reverse (23153512), we get a palindrome (44688644).

The spelling of 21535132 in words is "twenty-one million, five hundred thirty-five thousand, one hundred thirty-two".