21343056 has 40 divisors (see below), whose sum is σ = 63013824. Its totient is φ = 6097920.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343056 is 65034312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31425 + ... + 32096.

Almost surely, 2^21343056 is an apocalyptic number.

It is an amenable number.

21343056 is an abundant number, since it is smaller than the sum of its proper divisors (41670768).

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

21343056 is a wasteful number, since it uses less digits than its factorization.

21343056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63539 (or 63533 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21343056 is about 4619.8545431648. The cubic root of 21343056 is about 277.3866365946.

Adding to 21343056 its reverse (65034312), we get a palindrome (86377368).

The spelling of 21343056 in words is "twenty-one million, three hundred forty-three thousand, fifty-six".