21296984 has 8 divisors (see below), whose sum is σ = 39931860. Its totient is φ = 10648488.

The previous prime is 21296983. The next prime is 21296987. The reversal of 21296984 is 48969212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331054 + ... + 1331069.

Almost surely, 2^21296984 is an apocalyptic number.

It is an amenable number.

21296984 is a deficient number, since it is larger than the sum of its proper divisors (18634876).

21296984 is a wasteful number, since it uses less digits than its factorization.

21296984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662129 (or 2662125 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 21296984 is about 4614.8655451703. The cubic root of 21296984 is about 277.1869000651.

The spelling of 21296984 in words is "twenty-one million, two hundred ninety-six thousand, nine hundred eighty-four".