21711324 has 12 divisors (see below), whose sum is σ = 50659784. Its totient is φ = 7237104.

The previous prime is 21711317. The next prime is 21711331. The reversal of 21711324 is 42311712.

It is an interprime number because it is at equal distance from previous prime (21711317) and next prime (21711331).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21711324.

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, 904627 + ... + 904650.

Almost surely, 2^21711324 is an apocalyptic number.

It is an amenable number.

21711324 is an abundant number, since it is smaller than the sum of its proper divisors (28948460).

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

21711324 is a wasteful number, since it uses less digits than its factorization.

21711324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809284 (or 1809282 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 21711324 is about 4659.5411791291. The cubic root of 21711324 is about 278.9729550743.

The spelling of 21711324 in words is "twenty-one million, seven hundred eleven thousand, three hundred twenty-four".