21343324 has 6 divisors (see below), whose sum is σ = 37350824. Its totient is φ = 10671660.

The previous prime is 21343307. The next prime is 21343331. The reversal of 21343324 is 42334312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21343295 and 21343304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667912 + ... + 2667919.

Almost surely, 2^21343324 is an apocalyptic number.

It is an amenable number.

21343324 is a deficient number, since it is larger than the sum of its proper divisors (16007500).

21343324 is a wasteful number, since it uses less digits than its factorization.

21343324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335835 (or 5335833 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 21343324 is about 4619.8835483159. The cubic root of 21343324 is about 277.3877976171.

Adding to 21343324 its reverse (42334312), we get a palindrome (63677636).

The spelling of 21343324 in words is "twenty-one million, three hundred forty-three thousand, three hundred twenty-four".