21435324 has 12 divisors (see below), whose sum is σ = 50015784. Its totient is φ = 7145104.

The previous prime is 21435319. The next prime is 21435341. The reversal of 21435324 is 42353412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21435324² = 918946229969952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21435294 and 21435303.

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, 893127 + ... + 893150.

It is an arithmetic number, because the mean of its divisors is an integer number (4167982).

Almost surely, 2^21435324 is an apocalyptic number.

It is an amenable number.

21435324 is an abundant number, since it is smaller than the sum of its proper divisors (28580460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21435324 is a wasteful number, since it uses less digits than its factorization.

21435324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786284 (or 1786282 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21435324 is about 4629.8298024873. The cubic root of 21435324 is about 277.7857846344.

Adding to 21435324 its reverse (42353412), we get a palindrome (63788736).

The spelling of 21435324 in words is "twenty-one million, four hundred thirty-five thousand, three hundred twenty-four".