21496505 has 16 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 15891840.

The previous prime is 21496499. The next prime is 21496507. The reversal of 21496505 is 50569412.

It is a happy number.

It is not a de Polignac number, because 21496505 - 2¹² = 21492409 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21496507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^21496505 is an apocalyptic number.

It is an amenable number.

21496505 is a deficient number, since it is larger than the sum of its proper divisors (6324295).

21496505 is a wasteful number, since it uses less digits than its factorization.

21496505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 21496505 is about 4636.4323568882. The cubic root of 21496505 is about 278.0498202726.

The spelling of 21496505 in words is "twenty-one million, four hundred ninety-six thousand, five hundred five".