21732496 has 10 divisors (see below), whose sum is σ = 42106742. Its totient is φ = 10866240.

The previous prime is 21732481. The next prime is 21732497. The reversal of 21732496 is 69423712.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 4260096 = 4180^2 + 2064^2 .

It is not an unprimeable number, because it can be changed into a prime (21732497) 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 as a sum of consecutive naturals, namely, 679125 + ... + 679156.

Almost surely, 2^21732496 is an apocalyptic number.

It is an amenable number.

21732496 is a deficient number, since it is larger than the sum of its proper divisors (20374246).

21732496 is a wasteful number, since it uses less digits than its factorization.

21732496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358289 (or 1358283 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21732496 is about 4661.8125230429. The cubic root of 21732496 is about 279.0636066400.

The spelling of 21732496 in words is "twenty-one million, seven hundred thirty-two thousand, four hundred ninety-six".