21696484 has 6 divisors (see below), whose sum is σ = 37968854. Its totient is φ = 10848240.

The previous prime is 21696457. The next prime is 21696487. The reversal of 21696484 is 48469612.

It can be written as a sum of positive squares in only one way, i.e., 21622500 + 73984 = 4650^2 + 272^2 .

It is not an unprimeable number, because it can be changed into a prime (21696487) 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, 2712057 + ... + 2712064.

Almost surely, 2^21696484 is an apocalyptic number.

It is an amenable number.

21696484 is a deficient number, since it is larger than the sum of its proper divisors (16272370).

21696484 is a wasteful number, since it uses less digits than its factorization.

21696484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424125 (or 5424123 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 21696484 is about 4657.9484754557. The cubic root of 21696484 is about 278.9093799210.

The spelling of 21696484 in words is "twenty-one million, six hundred ninety-six thousand, four hundred eighty-four".