21433768 has 16 divisors (see below), whose sum is σ = 40248000. Its totient is φ = 10700976.

The previous prime is 21433751. The next prime is 21433771. The reversal of 21433768 is 86733412.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 5313 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (2515500).

Almost surely, 2^21433768 is an apocalyptic number.

It is an amenable number.

21433768 is a deficient number, since it is larger than the sum of its proper divisors (18814232).

21433768 is a wasteful number, since it uses less digits than its factorization.

21433768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984 (or 3980 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 21433768 is about 4629.6617587033. The cubic root of 21433768 is about 277.7790629392.

It can be divided in two parts, 21433 and 768, that added together give a square (22201 = 149²).

The spelling of 21433768 in words is "twenty-one million, four hundred thirty-three thousand, seven hundred sixty-eight".