21699248 has 20 divisors (see below), whose sum is σ = 42163968. Its totient is φ = 10818240.

The previous prime is 21699247. The next prime is 21699253. The reversal of 21699248 is 84299612.

It is not an unprimeable number, because it can be changed into a prime (21699247) 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, 4358 + ... + 7898.

Almost surely, 2^21699248 is an apocalyptic number.

It is an amenable number.

21699248 is a deficient number, since it is larger than the sum of its proper divisors (20464720).

21699248 is a wasteful number, since it uses less digits than its factorization.

21699248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932 (or 3926 counting only the distinct ones).

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

The square root of 21699248 is about 4658.2451631489. The cubic root of 21699248 is about 278.9212232039.

The spelling of 21699248 in words is "twenty-one million, six hundred ninety-nine thousand, two hundred forty-eight".