21434056 has 16 divisors (see below), whose sum is σ = 45930240. Its totient is φ = 9186000.

The previous prime is 21434053. The next prime is 21434099. The reversal of 21434056 is 65043412.

It is a super-2 number, since 2×21434056² = 918837513222272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21434056.

It is not an unprimeable number, because it can be changed into a prime (21434053) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 191320 + ... + 191431.

It is an arithmetic number, because the mean of its divisors is an integer number (2870640).

Almost surely, 2^21434056 is an apocalyptic number.

It is an amenable number.

21434056 is an abundant number, since it is smaller than the sum of its proper divisors (24496184).

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

21434056 is a wasteful number, since it uses less digits than its factorization.

21434056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382764 (or 382760 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21434056 is about 4629.6928623830. The cubic root of 21434056 is about 277.7803070822.

Adding to 21434056 its reverse (65043412), we get a palindrome (86477468).

The spelling of 21434056 in words is "twenty-one million, four hundred thirty-four thousand, fifty-six".