21360056 has 16 divisors (see below), whose sum is σ = 40115400. Its totient is φ = 10662624.

The previous prime is 21360013. The next prime is 21360083. The reversal of 21360056 is 65006312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4106 + ... + 7718.

Almost surely, 2^21360056 is an apocalyptic number.

It is an amenable number.

21360056 is a deficient number, since it is larger than the sum of its proper divisors (18755344).

21360056 is a wasteful number, since it uses less digits than its factorization.

21360056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358 (or 4354 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 21360056 is about 4621.6940617051. The cubic root of 21360056 is about 277.4602643102.

Adding to 21360056 its reverse (65006312), we get a palindrome (86366368).

The spelling of 21360056 in words is "twenty-one million, three hundred sixty thousand, fifty-six".