21363056 has 40 divisors (see below), whose sum is σ = 48632304. Its totient is φ = 8962560.

The previous prime is 21363047. The next prime is 21363059. The reversal of 21363056 is 65036312.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363059) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2381 + ... + 6956.

Almost surely, 2^21363056 is an apocalyptic number.

21363056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21363056 is an abundant number, since it is smaller than the sum of its proper divisors (27269248).

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

21363056 is a wasteful number, since it uses less digits than its factorization.

21363056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369 (or 9363 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21363056 is about 4622.0186066263. The cubic root of 21363056 is about 277.4732533808.

Adding to 21363056 its reverse (65036312), we get a palindrome (86399368).

The spelling of 21363056 in words is "twenty-one million, three hundred sixty-three thousand, fifty-six".