21189464 has 16 divisors (see below), whose sum is σ = 39921720. Its totient is φ = 10543680.

The previous prime is 21189451. The next prime is 21189473. The reversal of 21189464 is 46498112.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 4589 + ... + 7964.

Almost surely, 2^21189464 is an apocalyptic number.

It is an amenable number.

21189464 is a deficient number, since it is larger than the sum of its proper divisors (18732256).

21189464 is a wasteful number, since it uses less digits than its factorization.

21189464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770 (or 12766 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21189464 is about 4603.2014946122. The cubic root of 21189464 is about 276.7196440541.

The spelling of 21189464 in words is "twenty-one million, one hundred eighty-nine thousand, four hundred sixty-four".