21109468 has 12 divisors (see below), whose sum is σ = 37163952. Its totient is φ = 10491200.

The previous prime is 21109463. The next prime is 21109493. The reversal of 21109468 is 86490112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109463) 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, 15133 + ... + 16468.

It is an arithmetic number, because the mean of its divisors is an integer number (3096996).

Almost surely, 2^21109468 is an apocalyptic number.

It is an amenable number.

21109468 is a deficient number, since it is larger than the sum of its proper divisors (16054484).

21109468 is a wasteful number, since it uses less digits than its factorization.

21109468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31772 (or 31770 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21109468 is about 4594.5041081710. The cubic root of 21109468 is about 276.3709742265.

The spelling of 21109468 in words is "twenty-one million, one hundred nine thousand, four hundred sixty-eight".