21234568 has 16 divisors (see below), whose sum is σ = 40320000. Its totient is φ = 10482576.

The previous prime is 21234541. The next prime is 21234593. The reversal of 21234568 is 86543212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16168 + ... + 17431.

It is an arithmetic number, because the mean of its divisors is an integer number (2520000).

Almost surely, 2^21234568 is an apocalyptic number.

It is an amenable number.

21234568 is a deficient number, since it is larger than the sum of its proper divisors (19085432).

21234568 is a wasteful number, since it uses less digits than its factorization.

21234568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33684 (or 33680 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21234568 is about 4608.0980892338. The cubic root of 21234568 is about 276.9158471838.

The spelling of 21234568 in words is "twenty-one million, two hundred thirty-four thousand, five hundred sixty-eight".